Malicious PDF — malware analysis report

Static analysis result for SHA-256 6581b55a467aa866…

MALICIOUS

PDF

72.8 KB Created: 2021-01-05 04:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1f9ca3da7e64af9586b5431f5bda5f0c SHA-1: e7a5c6f72dcaf7d7bac2621bb388b6b2060c3400 SHA-256: 6581b55a467aa866a7cb47997cdac311e149f7a6895dea25d276456c8ed82768
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV detection and ML classification strongly indicate this is a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

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://trafftec.ru/aws?utm_term=battlefield+1+pc++free PDF link annotation
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/f672f1aed6a7d48.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/79hcghP/general_hospital_spoilers_scoops_and_rumors_today_news.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/xojodatefidikix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fe49efb3a0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f9fd579176e1.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/resavipibidote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff39da168c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fa4fadf16286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fe1a48e104a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5fe54b24b52e3.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/jataremuvoderes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jozetej/jitelirikalamozixasowef.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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 5072 bytes
SHA-256: f201996d720d0ff1ff63317bce8290fbab19ab0a86d97301bf7bb5a63833c258
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 10816 bytes
SHA-256: 5e8ee6a5fb1228be50657379011d127df3163c0ca53edc644ec02e99d5ce12d5

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