Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66291dcbae1175a…

MALICIOUS

PDF

74.7 KB Created: 2021-06-01 14:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11901faa4290d20e213736799ea75904 SHA-1: baf42a4b2d4c5c1c55dc89a61e0bd9b9975cad22 SHA-256: a66291dcbae1175af9c5eaa55b228cc19f9ea770da144fd8e6273e607c789ec8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and at least one URL is associated with known malicious redirector infrastructure. This suggests the document is part of a link farm or phishing campaign designed to lead users to malicious sites. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence score indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=wordscapes+level+2508+answers In PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/nifozotom.pdfIn PDF document text
    • https://najoduvojubowi.weebly.com/uploads/1/3/2/8/132815002/6358151.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/aa0094db.pdfIn PDF document text
    • https://xexewevifiwewol.weebly.com/uploads/1/3/6/0/136054804/7da7faa8a.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/tuborapa-puvitepifomap.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/pepux-gevoguvu-sipag-wavewebezifa.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/gatomoreruderexinu.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/64eb77e6-92ec-4105-86c7-c1c6c6739210/what_is_french_for_yes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652e56c1-1f58-4b73-a02a-f74d4c5305d8/kuzisimebozozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c1b3db-9450-4aa8-8324-62c72581160d/77005266546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0ffc14-7a2b-4992-84e6-9b243ea84581/what_are_job_opportunities_for_public_administration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e1d45d-0e5c-4dbd-9c88-258662a0187b/calories_in_freshii_mediterranean_bowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8355d9-64cf-4a89-b1e2-7a495b025224/to_kill_a_mockingbird_notes_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7e960e-19e1-453f-b71f-26dd8286386c/vicks_vapor_plug_in_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495d0eee-2014-460a-a824-305ef3c9edd9/dovejamat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ff95a5-9193-479c-994c-6ac13bbc5838/writing_effective_topic_sentences_ppt.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 5824 bytes
SHA-256: e9c43491d7dec1e48a249585f92c6d97497f647cbebad2b0cdff1907cdceedde
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10868 bytes
SHA-256: d0a05315a89765f1605b28460a560dcbc01cb44d6b8ba16ee6f3908048a04be8