Malicious PDF — malware analysis report

Static analysis result for SHA-256 5051a8f7dbe53349…

MALICIOUS

PDF

148.7 KB Created: 2021-01-18 05:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6623d37bc139012313025bbe546ed88 SHA-1: 4ec80dbe0720960e9fbf1b87b8f7e3ae3fe35531 SHA-256: 5051a8f7dbe533492160b1b40f2bb7cfa9e4461a7c64b20be25af439b64aba09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=an+introduction+to+sociolinguistics+janet+holmes+pdf PDF link annotation
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/1281184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fdfd1dd481b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420756/normal_5ff05f0522bc9.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/1864c74dd3.pdfIn PDF document text
    • http://tekeriset.iblogger.org/49135964033.pdfIn PDF document text
    • http://puxeguka.iblogger.org/lemuwigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5f99808762644.pdfIn PDF document text
    • https://site-1173692.mozfiles.com/files/1173692/wedding_ceremony_program_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5fa78b8631510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazaxese.epizy.com/moment_format_only_hours.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/33958863912.pdfIn PDF document text
    • http://defizal.epizy.com/king_triton_crown_template.pdfIn PDF document text
    • http://vovajixavago.epizy.com/email_asking_for_information.pdfIn PDF document text
    • http://gozotonitiki.epizy.com/51111581716.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_off00020c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C2C 5636 bytes
SHA-256: fa8ffdbd8e0f70d4fae6f507bfdad281fc723abda527b549acf744c087148df2
font_01_sfnt_off00021f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F30 11052 bytes
SHA-256: a2bd9dbd6453b124f22fbd8e317f7a371a198145eddc31b9d09f52f922345f00

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