Malicious PDF — malware analysis report

Static analysis result for SHA-256 29158b8bfa99773c…

MALICIOUS

PDF

75.4 KB Created: 2021-02-21 14:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 26f595e11b6113d4771f95673b126331 SHA-1: 54b6ed78b156f7108bf3e7f8b7dd4b3360d51caa SHA-256: 29158b8bfa99773c3445a72135fe914fbb35f9e130279afdac1453689349f89c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'manual'. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=malibu+landscape+lighting+transformer+manual PDF link annotation
    • http://haustova.com/330084142751wn7g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_60078bbbede85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420245/normal_5fc92d56bc852.pdfIn PDF document text
    • http://virulakud.iblogger.org/how_many_hours_are_required_to_be_considered_a_full_time_employee.pdfIn PDF document text
    • https://gufobetatogeset.weebly.com/uploads/1/3/1/0/131069923/367881ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff92b278fe7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_60153acad7c0c.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/PJgd0id/togozefokalakogabaxowesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_600d0c67a94d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nesowoxaxisaxa.rf.gd/bearing_nsk_catalog.pdfIn PDF document text
    • http://momerulazem.rf.gd/free_template_cv_professional.pdfIn PDF document text
    • http://bibarixe.epizy.com/koterivufufalifibofogaka.pdfIn PDF document text
    • http://wudokuzogikozu.rf.gd/cakewalk_by_bandlab_user_guide.pdfIn PDF document text
    • http://budibebolimuxo.rf.gd/iadt_guidelines_intrusion.pdfIn PDF document text
    • http://madulok.epizy.com/gexemorozowimijux.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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 5716 bytes
SHA-256: 2e9edea3f8d5fecd82494bd928920c31cff2200d45916f2aeed4aae27215bdf5
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 14052 bytes
SHA-256: cadc5622d05352237b63880c9cd1c5211c6d64f20cbd00b267642f20f39f6919

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