Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1880b1a1a4d1ec6…

MALICIOUS

PDF

104.7 KB Created: 2021-02-13 21:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 587633817d6798d81bc335f47a57da3f SHA-1: 4dabfecb3e4916e5a1243e8da38aff5b2bc2f253 SHA-256: b1880b1a1a4d1ec682cdb3a9b58a3cb3b1e4ef36f293c394df1456dbfac6d5a3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to known malicious redirectors or disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://yafferge.ru/123?utm_term=v+for+vendetta+summary In PDF document text
    • http://kamaz-ftc.com/98275950754d09f5.pdfIn PDF document text
    • https://cdn.sqhk.co/losopodelim/vlc38ib/xerasodupovatatibokalixuz.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/bupebibi.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/kimabonevdx7j.pdfIn PDF document text
    • http://indital.fun/migratory_birds_names_pictures_and_informationbum5k.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/a56f8ddd.pdfIn PDF document text
    • http://nesobaka3.xyz/hp_compaq_l2105tmpvffi.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/iaKCja8/63941889538.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/ojfhjP9/top_10_exploration_mods_minecraft.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/vavubepizu.pdfIn PDF document text
    • https://rogasiwenebagan.weebly.com/uploads/1/3/1/3/131380029/1228636bf430.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/6200030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegeduwamid.epizy.com/morpheme_exercises_with_answers.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_off00015d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D02 5148 bytes
SHA-256: 07cf98494262ac8dfd5df4c2cd482f169b21f2ad467b4c817ef34d3755b10835
font_01_sfnt_off00016e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E82 11868 bytes
SHA-256: 1238bb54acfb162a0169a0ab95ac3a11a07fb4412e78ac889d2d76d54ed25912

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