Malicious PDF — malware analysis report

Static analysis result for SHA-256 7337b3c0cba4f1ed…

MALICIOUS

PDF

67.5 KB Created: 2021-01-17 00:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0f5d4a34525ff2daace8d8eed55021c5 SHA-1: 2f02632a54e29f226a0fce5c25642f8b42acf384 SHA-256: 7337b3c0cba4f1edc885076d1bdf0f14550ee533be8538947849a151d6aee2be
252 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's part of a link farm designed to distribute traffic to various potentially malicious sites, masquerading as an order form to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/123?utm_term=bishops+storehouse+order+form+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8be19456864.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/outbreak_company_female_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_600110d3197d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f967da483037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5fb27585713d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fc2705dad042.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/fomaw-giwakipakaxum.pdfIn PDF document text
    • https://dakawowonogi.weebly.com/uploads/1/3/4/6/134663237/kijojibarimupajevo.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/xefuko_jadulogifu_fasakite_xalolarozibu.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/a46bd55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fe25246b9fd2.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/niwotipugonuvoz/android_studio_debug_on_usb_device.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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 5088 bytes
SHA-256: 651a5f56379b55fb47bef22fe9703d4263335dd3d4a663b1edcb165a0f6d99f8
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10300 bytes
SHA-256: 6ef26b125948c2ca526a9177f3778df616bd0a03de3aaaa78ce7994813bf7047

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