Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa7c7f998a485c…

MALICIOUS

PDF

67.0 KB Created: 2021-02-10 03:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2bcf010d600c70a8f050bae89255c4ed SHA-1: 69abde5ece4a6a32b0ec79d9c4706f030755fa55 SHA-256: f6fa7c7f998a485caeaad213132049d98d7b2548af6ff67ea14b625197172683
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 of which point to other PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=tu+fidelidad+es+grande+letra PDF link annotation
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/ce1ed71d3d732f.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/kgdvegh/deruwabogigazisedajokada.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/jeVLhbb/64048184687.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/suwiter.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ciiVgek/cardi_b_piano_tiles_games.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/hcT3NFZ/wodubujofudige.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/cHqjdih/76830060735.pdfIn PDF document text
    • http://promoocaoameericanas.com/43730424251buhne.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/nalosaro.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/f21d3121.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/aZibcc4/rebimaposeberijovarole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sedowedi/girubejesop.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/mewadovigaliliwofa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 4796 bytes
SHA-256: 3cd6a75a1db3397ed9330b33cfe114f8f21ce3bf5ddfc1cc92c0f03a1b69a199
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 10124 bytes
SHA-256: 7b1ceeab6448c5716f19afc847d8a36952e44dcc87d318548e10569fbea0219e
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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