Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa94ab6aac875e9b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 15:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81e8678f7119c663962ddb4beed943ef SHA-1: ffea4626299871a6e8f2bf564f36d007e97c2eb1 SHA-256: fa94ab6aac875e9b98b874743e241bbd9136ff6095ceb83ac6e3a65c9a7c3eef
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a product search term, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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 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://crophysi.ru/123?utm_term=fisher+price+rainforest+bouncer+seat+battery+replacement In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_601dc7dc84514.pdfIn PDF document text
    • http://craftsmansmetics.com/94072681078dx2c2.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/fa914b9f65e9.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/jdhf1OD/bombastic_bag_man_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_603e54e416b3e.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/fgUQ7ji/go_fish_rules_hoyle.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/2df36.pdfIn PDF document text
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/2800834.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/sajesibemapiworakam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff7d1218b3db.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/bgjhehg/bamejejijininide.pdfIn PDF document text
    • http://abanca-electronica.com/38774701423t2bkw.pdfIn PDF document text
    • http://bigmagazin.xyz/antivalores_de_los_ojos_de_mi_princefvhj1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fc7961b6b182.pdfIn PDF document text
    • http://tixshopclub.fun/weathering_with_you_eng_dubdn7a3.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ihdhhhQ/turn_off_automatic_calculation_in_excel_vba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 5452 bytes
SHA-256: 641d4b645967937501a5c55c3eaea53b4381c2f347f9df3b0328bf2a33e5f576
font_01_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 10784 bytes
SHA-256: 22f497df29c41a85a9a690a617368bf54d78aab28b239fe1ef463bcff1e28ea1

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