Malicious PDF — malware analysis report

Static analysis result for SHA-256 4497b1d03f5e5f84…

MALICIOUS

PDF

73.6 KB Created: 2021-03-31 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3265407f2989608e72ef51b380952b6 SHA-1: 1618c2f305fa15b2607387330d4b83a6937a182b SHA-256: 4497b1d03f5e5f84ba7c1e32cbe04dc2d048182a1830132da9207e44a36a18fd
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 0.9999

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://soxebez.ru/strik?utm_term=jlab+air+true+wireless+earbuds+pairing PDF link annotation
    • https://cdn.sqhk.co/xokebuzizo/jmxjbif/love_lyrics_status_video_download_sharechat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5fd95831cc68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_603030ae59d4c.pdfIn PDF document text
    • http://setlyb.online/susisafinazototidewhh5xc.pdfIn PDF document text
    • http://losmopaka.site/pibomamao23kc.pdfIn PDF document text
    • http://uspeh.icu/20640578892sy59m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60592fd84683e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60224486a60b8.pdfIn PDF document text
    • http://im-marceting.site/nixabamofalututugapajipulaydks.pdfIn PDF document text
    • http://thiswaytovogue.com/bolesaw_3_krzywousty_najwaniejsze_informacjeo2cnd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602c66fdb752d.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/Pjhhijc/cake_designs_for_weddings_classic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_6ffcb75cf034423e939f3485ecb04563.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_0663406609f5460abbe1fd7df2026e75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee34eef-e1e9-4a38-9d3a-a2c6e96cb562/was_the_forrest_fenn_treasure_found.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_c8503f387eef43039d75167940092c21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a949924-e97e-44a4-b3c3-d6379a061293/soleus_air_dehumidifier_reset.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d1be729be123469aa02bf5c075fcc164.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 5348 bytes
SHA-256: 1aa61b601d39953defed5e5e1e63f459c384c4f252997dd17a3ddfaffdb4ce31
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11188 bytes
SHA-256: 96d0b81f62082eb62f197df87e864845bd28b5496825ca16be251e92c72ecc2c

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