Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ad9b0c8f30f7c7…

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 09:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 454d5a7d61813be51b716057045cb222 SHA-1: 94e7b16ff28d246c8f814b44bcc37997018b01cf SHA-256: b1ad9b0c8f30f7c7f8acf41573ac71bf8cfb755d057e6e3e94e55f9b8256ac99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=ejercicios+resueltos+de+resolucion+de+triangulos+oblicuangulos PDF link annotation
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/0b9ebc8ecef.pdfIn PDF document text
    • http://lujoxowuri.iblogger.org/zurinepemagefowinalewezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_6022a1acd0c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_605b80dba75bc.pdfIn PDF document text
    • http://mazezoda.22web.org/40193642743.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/vilezagifizif.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/dasezedamemod_setoz_latetejututun_kutoxevef.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/4347024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_6037d1de5916a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5edc8db2-8a0c-4bb9-ba6c-1da909662fad/divefasevemirulazifuroji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad13312f-9377-4498-9757-5524ba7dfcbe/61603846056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50233d2a-c3a9-43e9-a666-bd628e07f030/how_to_use_weights_without_a_bench.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660928d2-2b14-4d4d-8b8d-cdacc1b69630/jawaputatelejugupamalu.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_64818cf5f6ac4295b018e0e5223607e8.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_f4f2123c1d68420893e3dd5a6217a970.pdf?index=trueIn PDF document text
    • http://sujekafejawojav.rf.gd/bmp180_bosch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be03abc-c65d-4445-bc66-874a6d01e1e8/95921409050.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_a6cc5253140542c7b2d1a08df19160da.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_f655e6f7b65b4cd69ea4e4b4c470bf85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18144b81-a705-4da9-afab-e66e7de74a6f/zakedazafejadopimupujadim.pdfIn PDF document text
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_2470e6f69fec4d9f8c69cba2f1dcbf3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f578b4cb-b180-41ce-9f0c-a02f43eaa213/46576455886.pdfIn PDF document text
    • http://fafusew.rf.gd/marathi_novels_kadambari_free_download.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 5164 bytes
SHA-256: 3c5764d4c6975af4bd6dfd29c779e18adc909a3704f94dc23da158ae145523f6
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 11484 bytes
SHA-256: 7e13bfdc4cb57de322e947d0cfb418398cd7fc5881fc2a4d7b796862f18773b9
font_03_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16304 bytes
SHA-256: 0a2507360a40dd56b84230664db2b3a2689cb34b0aa642599c8245950ba374cb
font_04_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.