Malicious PDF — malware analysis report

Static analysis result for SHA-256 348ce1eeb76a8919…

MALICIOUS

PDF

68.0 KB Created: 2021-01-14 23:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fb63df592fa3b59f09f72059cc5de597 SHA-1: 7310e0159db348957406b99cffa026fbf67516a0 SHA-256: 348ce1eeb76a8919f8ae067601cb91535e53fc12be0ba80ce98816851ce5c2b5
186 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. It contains a large number of external links, many pointing to disposable hosting services, suggesting it is part of an SEO spam or phishing campaign. The embedded URLs and the heuristic firings for PDF link farms strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/aws?utm_term=blank+label+template+avery+5160 PDF link annotation
    • https://site-1179057.mozfiles.com/files/1179057/74859339975.pdfIn PDF document text
    • https://site-1173386.mozfiles.com/files/1173386/70684533488.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/240074122.pdfIn PDF document text
    • https://fimagokuzite.weebly.com/uploads/1/3/4/6/134681622/dusesutupemekusixixo.pdfIn PDF document text
    • https://site-1217012.mozfiles.com/files/1217012/binomial_distribution_questions_and_answers.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/9774364.pdfIn PDF document text
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/2269299.pdfIn PDF document text
    • https://site-1174888.mozfiles.com/files/1174888/joomla_override_admin_template.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/e73effb403.pdfIn PDF document text
    • https://site-1178683.mozfiles.com/files/1178683/jaxegogibupovaniruwof.pdfIn PDF document text
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/lafujibodovu.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/rebomedug/cynthia_rowley_cat_sheets_tj_maxx.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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 5672 bytes
SHA-256: bcad4a4b2737d96f207facb1ee189428863d4e73975a126034fc3b98e516e747
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10588 bytes
SHA-256: 97443b6290b8369ca6b8484fe2954161a539d52114742438521c22c1dbcd8276

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