Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b38be74cf97a9…

MALICIOUS

PDF

83.5 KB Created: 2021-04-08 00:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: db47588ada2c57760bb654a7002e8794 SHA-1: 2cc28c9192e49d4f5177888e62110d524c219931 SHA-256: 6b8b38be74cf97a975c1a13e2c6dfed6baa309982cee3300248825361a548a31
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=bhopal+express+nizamuddin+platform+no In PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/5f89ae3046dab2.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/vawogasixeripozob.pdfIn PDF document text
    • http://plsale.pro/dazexirinojukifiliz7w4j.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/jozivofake-pimukasafida-mibug.pdfIn PDF document text
    • http://remontlegko.info/ancient_greece_timeline8b4sd.pdfIn PDF document text
    • http://vezugumak.22web.org/19786768315.pdfIn PDF document text
    • http://1xbet-registrat.site/592897977691xroz.pdfIn PDF document text
    • http://fozakewugumomig.22web.org/aprender_em_comunidade.pdfIn PDF document text
    • http://tigusomoxuwij.22web.org/vuzewelosanomeziga.pdfIn PDF document text
    • https://goxupoxujebab.weebly.com/uploads/1/3/4/8/134892745/e2f3a82.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/e3e3d66344.pdfIn PDF document text
    • http://hotel-engels.ru/47958948053jtbvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54fe3ed-f0e1-4c51-b3b9-5d85538195a5/wixurivejolanuxut.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_592f2d298d5e43de8bce3e0f27fb3737.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_0d7d12d0ae7749efaeef10b6074526de.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_a7e1563134e04864be5d090ccb7ea569.pdf?index=trueIn PDF document text
    • http://samanofi.epizy.com/71133695437.pdfIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_094a542890ce4da8bc3557a653a56798.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_978ff1b3b22a41199c2233a7f9be116a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/603d0666-cd17-436f-9978-0990c1d98b6a/56437850086.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_582dbf14038242aa9af50934b382c4be.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_0845ad89aa7143538b1b25d189b190d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35e54da-176b-4995-8060-a93a60c06900/20492615384.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_0901b810afac4036bf5a0a66f5d48a28.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_c3bca571c675425ebaa0c850286ce062.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df14f45a-7cb1-4351-bab5-10cf39f94cfa/quantitative_research_design_example.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_d6d56c68c2f149dcba13d69403c8311a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5448 bytes
SHA-256: e87fa69d20f412e92df056f07a7b0967416930bd1a10939d818f8b2c3aada7a0
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 11416 bytes
SHA-256: 4e4615a097cabb820d48dcc4f8b0b31cfeb5dbb61469c4555b24db5067ac8ec7
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 4340 bytes
SHA-256: e4e71f3540136d2b0b9ac4f640c4088c7475829ab281e9c021277ccce67b5bd2

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