Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76e7eadf5b47596…

MALICIOUS

PDF

63.5 KB Created: 2021-01-15 13:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a9ee73935cf1f09d48a085fe261981a SHA-1: 2ecabf5cf9a663409e34d285801762e743fe5af6 SHA-256: a76e7eadf5b47596cb2d37a5e612d2b0d53ff0ec148693dc9d780f7ad557db01
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external websites hosted on disposable domains or known redirectors. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with the document likely serving as a lure to phishing or malware distribution sites. No scripts were extracted, but the primary attack pattern is the creation of a link farm to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=fsrh+guidelines+hrt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_5fe98180cb3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd23ffd086a0.pdfIn PDF document text
    • https://fekadoripegat.weebly.com/uploads/1/3/4/5/134592683/13404327ea9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5fda8ce2138a2.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/4895599.pdfIn PDF document text
    • https://xananitape.weebly.com/uploads/1/3/4/0/134095977/bogokarenizixodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff64bb1ebcde.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/jovefu.pdfIn PDF document text
    • https://verorepu.weebly.com/uploads/1/3/4/7/134774070/jovejinunaz.pdfIn PDF document text
    • https://fidinavaxevipew.weebly.com/uploads/1/3/4/8/134876378/542778.pdfIn PDF document text
    • https://koturukumofup.weebly.com/uploads/1/3/4/8/134883222/7959639.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_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 4832 bytes
SHA-256: d21ccae0ce2dd80169f0426e73c05bc38c6f1c1014ec2ccce36413fcf4ea042a
font_01_sfnt_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 10136 bytes
SHA-256: 2d03b03ae0a415da3468e88725695a060114874952dc5502095be7b1d8e12c84

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