Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90c00da762bd0e0…

MALICIOUS

PDF

67.9 KB Created: 2020-12-18 22:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 636eb36ffa80f4aa547809ff9ecc34b8 SHA-1: d251110dbd87fe19a593ad4fd7cc2bf6489fc08d SHA-256: a90c00da762bd0e0c7950959d076e9a9180ffc8f00616c4fc99607440478b31c
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 are to benign-looking documents, but one is to a suspicious domain (trafftec.ru). The ML classifier and ClamAV heuristics strongly indicate maliciousness, likely related to phishing or a link farm for SEO manipulation. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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 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://trafftec.ru/123?utm_term=words+that+start+with+v+to+describe+someone+positively PDF link annotation
    • https://duxubekuzew.weebly.com/uploads/1/3/4/5/134506612/gepixil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf011e6d49a06bb562cbd/1606283281924/paul_bloom_against_empathy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c427ee-9f42-407a-9bac-9ee0da0eae7d/ropadaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64e9b2e537a05ef2de0c9/t/5fd1f7bca9eaf43bd858d9a6/1607595965643/sogosan.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/tv_guide_austin_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/67810840113.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/romifawolipeno.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc1e913fa04221c71647a4b/1606543636544/97137860588.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/neo_classical_school_of_criminology.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe13c0f81c9a2a0c6a1d53/1606292417060/longhorn_expiration_date_codes_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf2e60f2895dc1e766a0/t/5fc126e061e25426e161556d/1606493921238/bekegemipagixaxesekeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d08f6f5-cc3c-4c6b-bc56-7b1ca0bae598/87931046031.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b818a13a450babffe01a/t/5fc75c235060c93fcd7c6fda/1606900772014/95909223558.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf606564571256543299a8/1606377574137/26388221651.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/11637056231.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 5720 bytes
SHA-256: d666ff61d383949ed7b0eaa7774b0bafb745a1c767d8866eb1b013f364744577
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10500 bytes
SHA-256: a4e7418fe589304903b2b9c7e73a7d26d94adcebe8f4299c1836e2faad4f2d8d

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