Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44ddba28880ae09…

MALICIOUS

PDF

67.6 KB Created: 2021-01-06 22:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5603f394a764a0c06b6c1f80ce045e89 SHA-1: b1abd0b049a53f8c835baa222d8fc43108eadff4 SHA-256: a44ddba28880ae09669c5575d471e0ff9140f4efa7168e6bd5c4020ec0bcd485
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous links to external PDFs hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection further support its malicious nature.

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://gettraff.ru/aws?utm_term=affiche+publicitaire+vintage+grand+format In PDF document text
    • https://segamovav.weebly.com/uploads/1/3/4/8/134892249/e5d9ea.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/5807522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fd30b826e43c.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/pilodajazavafema.pdfIn PDF document text
    • https://tojibigunezo.weebly.com/uploads/1/3/4/6/134644172/sosibisafixejoradu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fe0fb3fc4ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fb60b816dd60.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/9823781.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/lileresajelo-tesidonumove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_5fb59cb0c3e50.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/xiwosutu_dudovixu_mupewefifobom.pdfIn PDF document text
    • https://sirubiruxegame.weebly.com/uploads/1/3/4/5/134581195/kifugugi-pewixoduvuruzag.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/muwomapotumugi/haughty_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/aristoteles_etica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37c126e-1c14-4a39-b8d0-61d5c0dd46a8/29194371455.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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 5580 bytes
SHA-256: 05da99e796a3e9a6611083f00540688f3d362a4fb0d940570ae52f5190671d45
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10940 bytes
SHA-256: c3a9275c92e01f2f97b3c31e4da753c66ff59a0dec0f4c2cb8ebc2a13c8cc3c3

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