Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6d258a17ed4d1b…

MALICIOUS

PDF

71.8 KB Created: 2021-02-20 18:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7b7cc39583b9ba7a7e0689b8d5bbe7c0 SHA-1: 3d5d4844072d193de696a9cb0ef712e7aab3bd8d SHA-256: 3a6d258a17ed4d1b876002ce8d8684232ff88ac619a4ceace98d8604b940a1ce
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered 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://druttle.ru/123?utm_term=what+are+the+bright+stars+tonight PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fca92544961a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5ff384030e8e4.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/191d3386204f7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_601bb9b8a559f.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/sodofileba-faxoruxokus-barifaxanokov-vaxajunigugir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5ffd57e43ab24.pdfIn PDF document text
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/5e911.pdfIn PDF document text
    • http://doluridibulif.iblogger.org/eva_foam_sheet_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_602063af2f1e8.pdfIn PDF document text
    • http://cashbackk.site/comfort_pro_apu_reset_buttonqiua8.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/gedafi-wusemuwobes-vigevixudex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_5fd878ad0851a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobawukesilebaf.epizy.com/fomozed.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/pilinizumolokeg.pdfIn PDF document text
    • http://sapuxomaz.epizy.com/xobidilezubenagogewat.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/9783488524.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ruronanejekajiraxejuteg.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/younger_ruel_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/dowodofovubamesuju.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 5068 bytes
SHA-256: f73f0aaba3e47c146bc9deba648a735d1524a4fa15d2aa7ae5b4f71dd2e27c3c
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 11124 bytes
SHA-256: 79ac6c9239e8d94a6621ae74ccc3c496a8ea10cf325dc75ac33e93528b0ea000

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