Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a404f76ace675b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-17 18:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e82fc24bca847d424f7c98bbd74715b2 SHA-1: b28557dd1d8cf6fe318ad2fc9300bc539cfc8d7f SHA-256: 41a404f76ace675bbc146fe68c4475ff9999b9d1c9d6cc46da3af2505b197999
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which appear to be disposable. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine rankings or track user interactions, potentially leading to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious SEO or link-farming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=barnett+vortex+compound+bow+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476147/normal_600354b37653f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5ff7d119657fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_601a05790b85f.pdfIn PDF document text
    • http://ketrovk.xyz/molofimamonarejoderiguazvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_60085b6257bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5fe8178034de4.pdfIn PDF document text
    • http://mscgis.net/26003304193m9tq9.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/zivomani.pdfIn PDF document text
    • https://gifaxefapi.weebly.com/uploads/1/3/4/5/134598377/widozetuziniru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_601a87aa7a00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6011eecb2c4ce.pdfIn PDF document text
    • http://apparentlyopt.com/70152825755j9cg8.pdfIn PDF document text
    • http://izzzaaa.space/eclipse_android_game_source_coden3kt9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/kugoti.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/bet_on_it_high_school_musical.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 8

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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 5596 bytes
SHA-256: 243e3403c990cd7d11d0a728be7a2cabcb7afa34a7ef37f8ff724ed66ce996db
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10612 bytes
SHA-256: 671b585f839ee561f01377698a15eaedefccf3f978df72202e84f6a683fdc7cb

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