Malicious PDF — malware analysis report

Static analysis result for SHA-256 523cb5039fdce6e2…

MALICIOUS

PDF

78.4 KB Created: 2021-01-26 03:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0cd6d149fe997259cd0684aedd3bb30b SHA-1: e36ff90e2ad6985287c892c83a01a758577d1aa6 SHA-256: 523cb5039fdce6e266d22d0630e573954fe728d688051df58bf80fb31b5c9a58
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs, including one that directly links to a potential VPN APK download, suggesting a phishing or malware distribution lure. The presence of multiple disposable domains and link farms further supports a malicious 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://trafftec.ru/123?utm_term=vpn+apk+download+free+app PDF link annotation
    • https://cdn.sqhk.co/vuzefegevo/aLMibib/71770156048.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/nupizobe.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/rejosewag_donulofapabuza_gokaxegajolizok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5fe8129e7c2d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_600236406689f.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/14869271909.pdfIn PDF document text
    • http://site-shop.xyz/vidmate_video_downloader_download_video_from_websitensid3.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/2181535.pdfIn PDF document text
    • http://zoneeuro.pro/67941314138rajdc.pdfIn PDF document text
    • http://markettop.pro/30533304582z3kdq.pdfIn PDF document text
    • http://opsnatur.fun/buzzer_sound_effect_buzzer_app_for_answers6947w.pdfIn PDF document text
    • http://fartook.online/simple_cake_designs_for_birthdayyowvd.pdfIn PDF document text
    • http://jewlgems.com/jakomamenxhy7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keximatefabuzi.rf.gd/55750225244.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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 4980 bytes
SHA-256: 620c873d53a4e345c6c05386e70a284ea5257f08d4b48c30183cab278de4afb3
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 11464 bytes
SHA-256: 4024bef3fe20624e84f300298b8f4d349cdd575efafdfa5b1eb2ce8d36036a3f

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