Malicious PDF — malware analysis report

Static analysis result for SHA-256 187352bb4559e367…

MALICIOUS

PDF

71.1 KB Created: 2021-04-21 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d67bdd4d112f5882535270acca95f3a9 SHA-1: 4385a39c65021b5565e50ac43ef38b526476cda7 SHA-256: 187352bb4559e3675325169f74f5562e868aa7d042a7addf830f8fe8c6f928d4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL, 'https://vilenefex.ru/strik?utm_term=shure+ulx+d%25276wh', flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, potentially for phishing or malware distribution, further supported by the presence of many URLs in the extracted evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=shure+ulx+d%25276wh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374545/normal_6039a14844645.pdfIn PDF document text
    • http://erogan24.website/35893810730m6j9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcff61fb1672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5fed446512e5c.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/53230695533.pdfIn PDF document text
    • http://hot-money.fun/jozanuwojekuniludijemoi9a8g.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/livre_communication_non_verbale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fd1f47c91345.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://repawusep.epizy.com/the_new_oxford_annotated_bible_with_apocrypha_4th_edition.pdfIn PDF document text
    • http://kerojuluped.epizy.com/48398995679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b2e7e4-bb80-4963-b28a-e0644796ddea/94512710805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b93a01d-a839-4747-a1c4-273218368d2a/38473524704.pdfIn PDF document text
    • http://zuzenif.rf.gd/pivimovamarofakekoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6af49a6-4237-4627-b302-573cf1e9c13c/redhead_dehydrator_cooking_time.pdfIn PDF document text
    • http://xoxexanizeb.epizy.com/bovuj.pdfIn PDF document text
    • http://bovilosewopu.epizy.com/taduzab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68c9db8-7c7d-43df-871e-6a48cce0d8b0/weber_gas_grill_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce0e9a6-8c70-4d73-af87-7c1d2c43335a/38677361568.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 4512 bytes
SHA-256: 942f738f31c9ea43987298a67ae77446c48330955451ac536caf04d49a86b6e7
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 11068 bytes
SHA-256: 354ff1c522eae0bc881eec7dccc07a241e307563e961d1b1ca1e311e6a814914
font_02_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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