Malicious PDF — malware analysis report

Static analysis result for SHA-256 28293f08011ac787…

MALICIOUS

PDF

72.4 KB Created: 2021-01-12 15:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 378ef5904152e12a0a12aab53c75a147 SHA-1: 7c5b327f4de3927ed23b67abbb44ca5edfb87256 SHA-256: 28293f08011ac787b737c54bfb42fb1051bb86cf16ad0f7def3468e221008fea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a "PDF link farm", directing users to various PDF files hosted on external domains. One such URL is https://trafffi.ru/123?utm_term=coil+pot+ideas, which appears to be part of a phishing or scam campaign. No scripts were extracted, but the presence of numerous external links suggests a drive-by download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=coil+pot+ideas PDF link annotation
    • https://cdn.sqhk.co/fofasafiwi/ghBUsic/xivugalatexilesesaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f8b92cca1844.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/mk8Qhbf/ivar_the_boneless_wife_alive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_5fbbfdd5afa88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fd18ec04fc9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb362a6e161.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/gjdDEcI/whack_your_ex_2_free_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5f94bb5e6db81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fc54e86eb369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fc9c43070c9e.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/wuxuziw.pdfIn PDF document text
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/9757207.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/3108053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 4764 bytes
SHA-256: ec997af652efbdba69efc4f390ef2a4a6f556a4155731db35b40a0db2dcf9d7f
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10496 bytes
SHA-256: ea8eea516c35631e2472d8f300ec3440e9419da2807d569616a0e3dcf229e8d6

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