Malicious PDF — malware analysis report

Static analysis result for SHA-256 4787475d5c12c72e…

MALICIOUS

PDF

76.8 KB Created: 2021-02-17 05:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ac5cfbe92c5255432416b580588b9d8f SHA-1: 40f9da9801235739cfb93b0a4870bbae2c717faf SHA-256: 4787475d5c12c72e97796dcd50a6d8ea009d2ffce2f27e04d5ce42cd371d4fe8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with heuristics suggesting it functions as a link farm on disposable hosting, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

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://baarspo.ru/123?utm_term=abb+distribution+transformer+maintenance+manual PDF link annotation
    • http://kersita.fun/screen_recorder_iphone_7_tidak_ada_suaracmf9u.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/zHIQihj/photomath_app_price.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/B52Xqih/average_cost_of_health_insurance_in_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/gcCgf4w/guvorojogurizaza.pdfIn PDF document text
    • http://mon-compte-cmb.best/zajafisovamudepubepgwlm6.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/75097698558.pdfIn PDF document text
    • http://in-step.shop/45012536264i0xfs.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/gvNhigh/lilebiferog.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/mGgdRhg/48658812141.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/lepilunuvapomimozuwoxobuj4bhf.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/bOihiil/85907415815.pdfIn PDF document text
    • http://ideal-it.fun/play_chess_against_computer_freeobk7c.pdfIn PDF document text
    • http://save50.pro/microbial_assay_of_antibioticsb2jj6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajumin.epizy.com/guwusobisivojupogop.pdfIn PDF document text
    • http://negifunowulag.rf.gd/96393791256.pdfIn PDF document text
    • http://xumutopefar.rf.gd/nojovojam.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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 5296 bytes
SHA-256: 77925e72aff237d2e8200f5c5b2f11c62e1128be6b6def82111a02785d223509
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 11112 bytes
SHA-256: 2934b4577264796c24fa3e5a9ccf740a9dca31755fbf0c93a50436eea4981126

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