Malicious PDF — malware analysis report

Static analysis result for SHA-256 536b9116532d7346…

MALICIOUS

PDF

75.6 KB Created: 2021-02-22 02:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6645b1e2a4e05ed382cefef06be114d1 SHA-1: 9c76a27eca3bc63113a151b1f440e8d84603d5ed SHA-256: 536b9116532d7346942f3584d0a367a0e8e9f723e9e83fbcf08d2fb35e46bcaa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, which is characteristic of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=international+business+development+jobs+nyc
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/5291114.pdf
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/7e97f361c7e1.pdf
    • https://cdn.sqhk.co/xavonepez/gczgjhi/87974662842.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/tirefomijirutex_gejoneni_mixolir.pdf
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/debudi_letube_vosukurobanaber_woluzubasa.pdf
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/1561096.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/sexuruna_zabiwiferetusur_bitaripexubug_zisibefepuwo.pdf
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/5951376.pdf
    • https://talasawag.weebly.com/uploads/1/3/4/2/134265385/setigafane.pdf
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/8a715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bulolimepol/certificate_of_excellence_template_google_docs.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/bts_video_call_pro_apk.pdf
    • http://dipulitexaxuz.epizy.com/iso_9001_version_2015_resumen.pdf
    • https://s3.amazonaws.com/xulikamul/42682844596.pdf
    • http://dizakopalelur.epizy.com/character_description_worksheet_nz.pdf
    • http://mujixexebekipan.rf.gd/82229147156.pdf
    • http://nugafafekovad.epizy.com/letibebozojowowevunoxo.pdf
    • http://tifiponarem.rf.gd/het_achterhuis_anne_frank.pdf
    • https://s3.amazonaws.com/zuponefi/fazebikexafi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea3.bin
4fd84089c0d0f1bf855eb058d3522f14b88ae4dcfafbee54b277fc28048e64aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 5416 bytes
font_01_sfnt_off0000f0f1.bin
1bb6ce9c766567c86d2cb12b2793ed406ef5bdd1b9d28ad43f299453a2e4d5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 10040 bytes
font_02_sfnt_off0001132e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 4324 bytes

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