Malicious PDF — malware analysis report

Static analysis result for SHA-256 42146126baea5bcd…

MALICIOUS

PDF

71.0 KB Created: 2020-11-09 17:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f739dcad764d4d27ca92145f8fae55f7 SHA-1: 155657e4951f134a577d994b56b4165b74be06ab SHA-256: 42146126baea5bcdde7dcd900b77a681736d0349000609a448f7f70d4aa6b055
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a large number of links pointing to redirectors, with one prominent URL being 'https://trafffi.ru/aws?keyword=must+read+books+bill+gates'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?keyword=must+read+books+bill+gates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f89c1656e5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fa92c6b77432.pdfIn PDF document text
    • https://kuxunudizovisaj.weebly.com/uploads/1/3/4/3/134321976/6715624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5fa0b80ab9b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fa89e5e3d32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f906568b141c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f8c62e2ae4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f872124c9b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8b6321d2f45.pdfIn PDF document text
    • https://gipivibeg.weebly.com/uploads/1/3/4/3/134341606/panizudij_jowipek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f97c1e3799bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34a2d21-514e-4f9b-9fd5-2141b9a96d6e/14748554760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7860cbc-928c-4dbb-ad55-be33e55157a0/34491519067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32597e63-ea0c-454b-b4ee-11b40a2b6c5b/jalenoxodawitojezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cba5b3-770e-419c-be2d-235609123c29/s8630_fujifilm_camera_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6731073c-b422-4905-a38b-47bbaaccc196/xekolafasegovutozare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca135847-0a46-4cb7-a3d4-5f045455983c/318042235.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 5204 bytes
SHA-256: 54a68d649f6c191dd16f1df77c648f6a989492d4253f2e291a259a303c045e28
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10356 bytes
SHA-256: ed600909109fe9ca0831ed9440a79968c63a01b91fc74c82b5c4df635384b5f6

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