Malicious PDF — malware analysis report

Static analysis result for SHA-256 0083b8acf0fae3e1…

MALICIOUS

PDF

85.7 KB Created: 2021-03-02 20:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: da6e043c9a5f559b584abccbe7d0ce1a SHA-1: 0cd4c00c9c262c3405d06b2971659d7b70a4d251 SHA-256: 0083b8acf0fae3e1a84567c41a2db59c37461eeeb83d3cfc2acf5ed0812da191
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with a construction safety course lure. The PDF structure suggests it functions as a link farm, directing users to potentially malicious external sites.

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://midufefew.ru/123?utm_term=osha+10+construction+safety+course PDF link annotation
    • https://nizitorewazoxi.weebly.com/uploads/1/3/4/7/134704220/3373937.pdfIn PDF document text
    • http://tulakijumipad.22web.org/nufegiwelolex.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/what_is_the_keto_reset_diet_plan_to_follow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_600363496d8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_602f99ecf1663.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/boganefezugadudugazo.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/73255167513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376404/normal_5fee3e7764a9f.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/1475855.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/kenneth_cole_reaction_watch_band_adjustment.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/d7813014dcde65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_602dd717d3370.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
    • http://sebipukavore.epizy.com/27415228923.pdfIn PDF document text
    • http://figabubif.rf.gd/sunefe.pdfIn PDF document text
    • http://nijunopuk.rf.gd/dowawegebawu.pdfIn PDF document text
    • http://bitediwufekoxem.epizy.com/hanuman_songs_in_tamil.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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 5144 bytes
SHA-256: 7b63425a3b38b1f275bd3382a2bb78b2d1c98e11d86c4c7c04e2b2e6ec18a3d1
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 11100 bytes
SHA-256: 527e0a08c57e3774edb814c81f242d7710caaa454b244da797442a1038eafefd
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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