Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a28b93da66ee5f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 19:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca45361279b7eb8a0bc53cfd24f0739 SHA-1: 75cc8839eb412fc75b422cdd2841ad1a87647141 SHA-256: b4a28b93da66ee5fd41b66cf6200679e3ad58fd0ea888ec11b97785b88b2829a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to seemingly unrelated PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate an attempt to redirect the user to potentially malicious content, possibly exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=greed+quotes+in+lord+of+the+flies
    • https://cdn.sqhk.co/vawapisoxe/9jfEjbd/36198139886.pdf
    • http://straponartist.com/officiating_and_coaching47unt.pdf
    • http://adanakebap.org/mercedes_amg_gtr_iphone_wallpaper8pnhi.pdf
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/49fb0f.pdf
    • http://myshoes.moscow/549939189463t6hj.pdf
    • http://jokebixa.22web.org/animation_desk_paid_apk.pdf
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/6fc23ba1.pdf
    • http://valaporinepisu.22web.org/difference_between_virus_and_bacteria_ppt.pdf
    • http://iclod.tech/zodoxofod5a4he.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jawusawar/can_i_get_metal_gear_solid_4_on_ps4.pdf
    • https://s3.amazonaws.com/zasepo/4376493922.pdf
    • http://suferipuwa.epizy.com/22987165505.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/latest_biodata_format_for_marriage_in_marathi.pdf
    • https://s3.amazonaws.com/fofeguj/kosifupikoxikonig.pdf
    • https://s3.amazonaws.com/fuwawibu/bbc_learning_english_drama.pdf
    • http://zunebafovako.epizy.com/bali_road_map.pdf
    • http://kimibixapi.epizy.com/basowikigilu.pdf
    • 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_off0000e67b.bin
347b9d7ffd6fa5c40c69fdab1a358ff8d70ca4a365deb445be6f13de4b658078		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 4940 bytes
font_01_sfnt_off0000f742.bin
8d6ced10ddd85301d7c9cab06441ff5a8bfcad3b48cf9394da23c19d362c5fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10376 bytes

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