Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9887e4ac89a1140…

MALICIOUS

PDF

88.6 KB Created: 2021-03-14 04:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2c3f71c8a5988eb1664bb8adfaa9d8d SHA-1: dd7be9307ec9c50f78c0846a5dcad3ff7eeff9d1 SHA-256: e9887e4ac89a114033d3b46a50b9916ad748e5354ed68640ba121e326eb493a7
186 Risk Score

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=global+aviation+industry+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491723/normal_6044671c02f6c.pdfIn PDF document text
    • http://vofufime.mypressonline.com/46246904726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_603e9125120af.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/6.7_powerstroke_transmission_fluid_type.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/jejamiridon.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/78362682726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5fc8c64e8b606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_60404ed22516d.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/54645924754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_602be716b729e.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/how_many_calories_does_an_ear_of_sweet_corn_have.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/2011_hyundai_sonata_2.0t_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_603d11a550178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_600b622e932ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5feba4cb112e5.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/89685152800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_601a4c6fdddfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_e096b67b9c774f629f4bf671041a49c4.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/manuale_arduino_starter_kit_italiano.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_ee08a90a5113464989c652d842e83ca0.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_f3c15bb667684a56852a882a1d6cc293.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_192e750dfb2545f9a5621eade53ef5f9.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_c3df791296f145f2869ae2cd3ae72a28.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 5284 bytes
SHA-256: f8c32cf095df321c1d4e1321387bf05e29ab803a8b1b22edbada2517ab8994cd
font_01_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 11084 bytes
SHA-256: bc12326abd72499ad2f9c35c3903573537ce86185737965a553502f185302fa6