Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f7421dd09f192c…

MALICIOUS

PDF

86.6 KB Created: 2021-02-13 19:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bbd8e5131011aa701356214397848a29 SHA-1: a85d2f8c6d8c45f14eaaad650a33d12ef8a25e36 SHA-256: 10f7421dd09f192c4c5e8757d9f2ac9244aa7de4afab6eab5303f8c5553da32c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which are disposable or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=synaptic+signaling+ap+bio PDF link annotation
    • https://cdn.sqhk.co/bugolajoxodu/fQhjifv/fakisinot.pdfIn PDF document text
    • http://gelivebun.22web.org/transformers_botbots_toys_r_us.pdfIn PDF document text
    • http://reduslim-europa.site/agri_junction_application_formuipw5.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/cQhegdP/lomopeturex.pdfIn PDF document text
    • http://55571.ru/141240291128lb70.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/dyhegi8/mojufigopo.pdfIn PDF document text
    • http://ighelpcenter.xyz/7122470169egg46.pdfIn PDF document text
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/545025.pdfIn PDF document text
    • http://max-lifting.store/vikisurunovexaezlw8.pdfIn PDF document text
    • http://abreudesigns.com/447711616834coy6.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jh4CYif/teniminixa.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/super_bino_go_mod_apk_1.0.3fbd6z.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/eMjahap/40349418626.pdfIn PDF document text
    • https://potezevaledu.weebly.com/uploads/1/3/1/4/131406960/d8db8bc19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miduzusajaveg.rf.gd/74468095519.pdfIn PDF document text
    • http://xegebasitez.rf.gd/84212490202.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 5352 bytes
SHA-256: eded9fe4f8f58649f6f62fb86e55baf83f953a34670bf05b25dca7bb7fd909d7
font_01_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 11508 bytes
SHA-256: c8f1a5ed066159407b88b17cb00ebe108c6d4f6871b247045091d287876f0926

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