Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccab147a5d118fe4…

MALICIOUS

PDF

76.5 KB Created: 2021-05-03 22:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6abf22a3ca9bfb54ef74cfcd76ecb163 SHA-1: 3cf9e0fa9b11e37f211f5d6011760db389c630ac SHA-256: ccab147a5d118fe4af841253df429d25601077f5ec3b527f7410036bc0bc70c8
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to lead users to malicious sites, likely as part of a phishing campaign.

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 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://seumenha.ru/strik?utm_term=hp+laserjet+1100a+service+manual.pdf In PDF document text
    • https://cdn.sqhk.co/zipirevofu/tigfhcT/13932977023.pdfIn PDF document text
    • https://cdn.sqhk.co/jinatopa/gdav9id/fall_coloring_pages_for_adults_with_dementia.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hjiegff/rubokisefemizajuxuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fd9074d62810.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5fefff2cd2f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_603d1ee475f5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5ff65229e5403.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_to_make_a_book_jacket_with_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jehgih9/wutotukededodubivi.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/TgfnqUp/52128952520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_602b521fc827c.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jc5hhib/marco_s_pizza_menu_and_prices_bahamas.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/9ja4xty/wordscapes_level_8519.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/XR2gihA/92729316519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemileti.atwebpages.com/gameshark_cheat_codes_pokemon_emerald.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_babc7557b546458489ba8cd410f10e11.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_51614d111be34a0baa7e97ca24a4fd25.pdf?index=trueIn 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_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5624 bytes
SHA-256: 56b1c5360a7f50349ea7733ebf3c59d07991bbb39addcc650c3afa9e3d5497e0
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 10912 bytes
SHA-256: 72a0f825e90678ab0a2548c5c1a03bfe4acacc270733ea80deb853cb40e22981

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