Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d9f6d454a16226…

MALICIOUS

PDF

72.3 KB Created: 2021-01-11 08:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 53f3d08c9989c30a23e1ed95e1d3da1d SHA-1: 9414edd975a4cb4fd6eaf3c6a52fad7d473dacd6 SHA-256: d7d9f6d454a16226f196ea1bcd8eb7e581bad5ba459bd65f7971eb7b1adbc3ae
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting it is part of a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is used to host a mass of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/aws?utm_term=cover+page+template+report+free PDF link annotation
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/d06d9189d2a.pdfIn PDF document text
    • https://namonizumus.weebly.com/uploads/1/3/4/3/134345036/4277609e93e33f.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/nasasomidi_nosigisibixa_biravasate.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/jirigugi.pdfIn PDF document text
    • https://site-1178097.mozfiles.com/files/1178097/41252910847.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/jadawu.pdfIn PDF document text
    • https://site-1176979.mozfiles.com/files/1176979/famegan.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/easy_electronic_diy_projects.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/79413.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/mewezekilafef/xasetodafisepidewogape.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/pagorigavubilizemapama.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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5008 bytes
SHA-256: 8361a5a3c114bcde53794c93269eb10b4e7d28f474b38f3aa2970cec4c3ae7ad
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 10420 bytes
SHA-256: df1fc018b72e251b9dea5ef24c22221f71e23216d2fbf06d99e4de458f583e37

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