Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636716920317ec2…

MALICIOUS

PDF

70.2 KB Created: 2021-03-28 23:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9920d5c3be6ba6f2f30cd048eb04b5dc SHA-1: ac5fd09ff5c665838d3b2fa5551e37ec48baa074 SHA-256: b636716920317ec2c620e733bfc39f52a4edd84a929f089479e877f196236b9f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially as part of a spearphishing 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 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/123?utm_term=primary+colors+worksheet+for+kindergarten
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/gorotininunola.pdf
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ffbd724b793d.pdf
    • http://salonhq.xyz/66476785041mlub2.pdf
    • http://soul-felt.com/how_to_check_covid_19_result_in_saudi_arabiaggbjl.pdf
    • http://chaptejvxz.fun/fapipelugugadidojedesoan8ya.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_604906f53a74b.pdf
    • https://cdn-cms.f-static.net/uploads/4488130/normal_604d0a1945e6c.pdf
    • https://cdn-cms.f-static.net/uploads/4421205/normal_600d61f8868ad.pdf
    • http://216tilford.com/are_uk_postage_rates_going_up_in_2020sgse5.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/zonapawudorep_jugugeva_puzukuwovexoko_dedof.pdf
    • https://cdn-cms.f-static.net/uploads/4403556/normal_603ac7ca673c4.pdf
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/rasidoguzelu-vazomu-fonukunapudag-wotaxa.pdf
    • https://cdn.sqhk.co/xovepejegosi/ck5b3uJ/hepatitis_a_treatment_at_home.pdf
    • https://cdn-cms.f-static.net/uploads/4473052/normal_601fa9420719c.pdf
    • http://stixlife.info/667627341465q8fk.pdf
    • https://cdn.sqhk.co/tizadufof/hrovBAw/uc_browser_free_new_version.pdf
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5fe74cd5cd3a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fd.bin
9a696663507ec6643baa0bfaaa2baa933c59ec820857f2316a057952f8a1ea77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 5692 bytes
font_01_sfnt_off0000e74b.bin
356e3e1908a828ceca2dfdb3cffe33083f9a54cabf6f2dd1b41d56547a5848d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10652 bytes

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