Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cc171d4f407b8a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-19 20:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6eb55c8213d6d596b048a4fd896db2ce SHA-1: 4b0bfb8fbbbb933586c24c1f5242d876d949db5c SHA-256: 22cc171d4f407b8a732c3a5ffd01eddd57f09ae4e6a2279d3913d7e4a5f8b98d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

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://bologen.ru/wix?keyword=webster%2527s+ninth+new+collegiate+dictionary+pdf PDF link annotation
    • http://startask.ru/467325329674tod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fe3e7c518c06.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/2141550.pdfIn PDF document text
    • http://topcabinets.xyz/62126331020j4jj4.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/sovepiludepiruf.pdfIn PDF document text
    • http://universal-kirov.ru/voruzixejamigerixusiti2mlil.pdfIn PDF document text
    • http://exemplpusj.com/wodefidifebulovomakeaw1gn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5ff0a61540ec8.pdfIn PDF document text
    • http://50offshop.info/uk_practical_driving_test_marking_sheetidb1x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5fda4835eda41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff11d701577a.pdfIn PDF document text
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/768778.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/zunewidimem/pilajepedawo.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/best_stock_market_books_to_read.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/kagetokejerijikejazupi.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5800 bytes
SHA-256: 0dac02e85e8bb49b06104b2c7f4763f7b46f3e1b31fc7675ce90b2e9e7b7e3dd
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10600 bytes
SHA-256: b813dcb6a31954c83220b1781c66fe98ad8538795059d9bbdffb22cc8d0fc2f8

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