Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b954610ab84581…

MALICIOUS

PDF

82.5 KB Created: 2021-03-13 18:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c5de9a413833d951d5a44b45e7222c SHA-1: b385b32bcae9b13410b1ed263f44a108808fabff SHA-256: 79b954610ab845812df42c786215d2d120d22cd4983b456ce0e2ed808ad4b809
196 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are algorithmically generated and point to PDF files, indicating a link farm or SEO abuse tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves redirecting users to potentially malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dafemum.ru/123?utm_term=bootstrap+responsive+template+code
    • http://specrazreshenie.com/familial_hypercholesterolemia_screening_guidelines1q98m.pdf
    • http://kigurumi.org/vuzebepivogomekubomunobapxbdtc.pdf
    • https://cdn.sqhk.co/norifasil/ifliggg/sports_car_hire_brisbane_formal.pdf
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6047f17dce57d.pdf
    • https://cdn.sqhk.co/janawezexoj/wic3hga/pc_smokin_stampede_bbq_sauce.pdf
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/sivarokolepuzitepigu.pdf
    • http://m-laskin.ru/jukaludajasolerabuzi0ybbj.pdf
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/nanoxijujigepofom.pdf
    • https://cdn.sqhk.co/kavejufa/hihiijK/diy_face_masks_for_blackheads.pdf
    • https://cdn.sqhk.co/fevivesuxofo/agdgdhe/loxakurafufalesuwimipitiv.pdf
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60395ff0be795.pdf
    • https://cdn.sqhk.co/morovujefi/haicIgj/12291568025.pdf
    • https://cdn.sqhk.co/veletafi/ihYgctS/77057386613.pdf
    • http://werenntaq.online/57405044788efnw6.pdf
    • https://cdn.sqhk.co/wugoxoxowex/dRjccSg/3878111253.pdf
    • https://cdn.sqhk.co/sivefuxonix/jdRvhjf/defor.pdf
    • https://static.s123-cdn-static.com/uploads/4369149/normal_60004e64c6d73.pdf
    • https://cdn.sqhk.co/lagolipumepi/rZxxOja/bluestone_perennials_free_shipping.pdf
    • http://kernig.pro/820028539457hkkl.pdf
    • https://notagudoda.weebly.com/uploads/1/3/0/7/130776089/0830c3581cf3e.pdf
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/3703436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065a.bin
170e36ffce54cd681052968c2b772f4905fa76b1f7e1f0061195b1ca98713198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 5328 bytes
font_01_sfnt_off00011870.bin
979390026cd90d998abddf928fa13b562ca5308a18d8dd5a1cf76b2a506b46f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 10664 bytes

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