Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f104a3e01125b…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 03:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 83eb499732d7852ecb59eb394237844b SHA-1: 283db94106241335f6e88041553977171b0a1905 SHA-256: ab3f104a3e01125baecc2e5f9680256eb6506d888eac1e2d621f6ea986e66af0
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=stihl+hedge+trimmers+home+depot PDF link annotation
    • http://lowwsaw.xyz/are_dna_tests_very_accuratevmoap.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/82737682ea8198.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/gif60ii/easy_to_use_cnc_router_software.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/jokesotifaloguro.pdfIn PDF document text
    • http://wiinorama.fun/planet_of_slums_mike_davis_summaryegyiz.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/55642652921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469849/normal_603cc69fe2b3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fe30b5ad1b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60df3cdbf2.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/7616483.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/bugler_s_holiday_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451217/normal_5fc99c6f24b90.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/f53b9d67a15909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_60512d0e221ff.pdfIn PDF document text
    • https://cdn.sqhk.co/mazasofuw/idDibjd/cooking_tycoon_gameplay.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/8c312d1c12b9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455659/normal_5ffca21a46a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_60525f6b6965a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496372/normal_5ffca06feb35f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_6015023537ea8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidejepeko.onlinewebshop.net/certification_of_origin_template.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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5268 bytes
SHA-256: cc0a9c8fadb361bc6e11b265719c52813150672c51efd9109a87965877eed36b
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 11332 bytes
SHA-256: c878670c9f6826c30d65ee89d20e83270d301d6dc7bd0d124e3f92fb919bf63a

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