Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a14ec697bb613f…

MALICIOUS

PDF

76.2 KB Created: 2020-12-29 16:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 431e7e918c1c34007aa4428d0ac11582 SHA-1: ebae51277793f9e7ae7f902943a17d25896fb636 SHA-256: 04a14ec697bb613f998313ccba9b233f9e8d8ec171b923aaf45e3875d5f8674f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'traffine.ru', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm hosted on disposable domains.

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://traffine.ru/123?utm_term=highest+gpa+you+can+get+in+high+school PDF link annotation
    • https://cdn.sqhk.co/fuzokikili/ggjgjjj/dobijojefiperutelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_5f9967f48f049.pdfIn PDF document text
    • https://cdn.sqhk.co/terexugureto/fFd7jel/linearly_independent_zero_vectors_proof.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/9910648.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/1589089.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/dmsiazl/lakujefitib.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/viridaterezudigiden.pdfIn PDF document text
    • https://denudosija.weebly.com/uploads/1/3/4/0/134017010/luben.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/suvex-xebubonozov-gavubukegago.pdfIn PDF document text
    • https://wepubimixojipo.weebly.com/uploads/1/3/4/5/134584552/bepebexivufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wemazun/header_text_table_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/bronze_age_clothing_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/81908993107.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/printable_ballard_score_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 5044 bytes
SHA-256: 5f29c681584f2ed2c1e5de96b82668e10b2f62aea210bb73af89f87ea976c7a9
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10276 bytes
SHA-256: 81b3869af2e605eddb9e4b1af2527af8fa46b25751fb1dcdf203ea8276461d2a
font_02_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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