Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914e1a2bc0160e9…

MALICIOUS

PDF

66.8 KB Created: 2021-02-26 16:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6668ef3df99ac04d5f59fd5e596d378c SHA-1: 177ac4157b298bdba2a4df1b096e0f6213fd1ff1 SHA-256: a914e1a2bc0160e959841a402663872318dd1193f3845946994de5d3b39dfcd0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which is disguised as a job search result, suggesting a phishing or credential harvesting lure. The presence of wkhtmltopdf in the metadata and the embedded URLs point towards a document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/award?keyword=information+technology+director+jobs+near+me PDF link annotation
    • http://xufededubumavif.scienceontheweb.net/qu_alimentos_son_buenos_para_bajar_los_triglicridos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_600ad70ba66dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_5ff8791544925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_601e6eb43c3d0.pdfIn PDF document text
    • https://tadegelu.weebly.com/uploads/1/3/4/7/134734806/1e7896d83687dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_60199d9eb307f.pdfIn PDF document text
    • http://wopedejani.iblogger.org/anatomy_book_for_nursing_students.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/what_is_the_length_of_the_5_longest_rivers_in_the_world.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakafovoda.epizy.com/how_to_change_time_on_nortel_networks_phone_t7208.pdfIn PDF document text
    • http://womawujun.atwebpages.com/18909193638.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_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 5688 bytes
SHA-256: 6a0c1084cf2ffd40d359639a1841adf0329ddb5085e6d30cf7e60c340ca4cad1
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10460 bytes
SHA-256: d35c3bc7c659bf78177a42b0d63337758524fffce0bf3c7e82447bdbaf658a4c

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