Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc6e09fd33a8b51…

MALICIOUS

PDF

79.8 KB Created: 2021-02-24 15:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e41230a8a8e3c6495ecd1fc700dede7d SHA-1: 80bc08b904afba3ece5dae6f26c69eb52eb3c235 SHA-256: 4cc6e09fd33a8b51d8c2c17e77f6e850b830ca604e144d473a95061ca37b94c1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content or facilitate further distribution.

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://jottigo.ru/award?keyword=plt+legend+color PDF link annotation
    • https://cdn.sqhk.co/kamupudoro/wnfGjcb/64731500705.pdfIn PDF document text
    • http://healthit.space/dopetevubiwexokugifideji5oxhw.pdfIn PDF document text
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/8b3c4f82cb8151.pdfIn PDF document text
    • http://bonus332.site/25623522090gxlw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd1c81a81aaa.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/mutuviviragamen-zodazuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffe528246f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/hjgihh1/stock_tanks_for_sale_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/a8icoid/warlings_armageddon_hack_apk_android_1.pdfIn PDF document text
    • http://trenolgia.buzz/percy_jackson_and_the_lightning_thief_movie_charactersvpnqp.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/a7ibzj3/512738465.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
    • http://sanemogoxidiwus.epizy.com/22641852461.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/mandatory_reporting_guidelines_nsw.pdfIn PDF document text
    • http://mivezemobopu.rf.gd/a_dance_of_dragons_chapter_summary.pdfIn PDF document text
    • http://mixawulemago.epizy.com/977805493.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 4460 bytes
SHA-256: 44614c588ee7bff30a7fedc7f16a5f205f2ad74f89b78c7cd145686802f0a29f
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11044 bytes
SHA-256: f7c33937844b485a786dcbe4461472e686f4e01758744f013d864ba467b63b84
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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