Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4cbeea49fea68…

MALICIOUS

PDF

75.2 KB Created: 2021-02-12 11:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a7357d8d6f7b9f279e58a7f03556644 SHA-1: 8724bbcdaa1dea1668cb86c693cfc6b4e4f2f2dd SHA-256: 41b4cbeea49fea6823c97ebc442b1e30d1912822d08aabf6b47d6bf57a2e10a9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

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://jacksth.ru/123?utm_term=1d4chan+planescape+factions PDF link annotation
    • http://copyright-help-center.com/deloitte_vietnam_transparency_reportesqj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601a1009570cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_60116e5f6fcc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6012167996276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_6024032d82708.pdfIn PDF document text
    • http://drilltech.info/84138661998j85vm.pdfIn PDF document text
    • http://everydays.space/tijilazadifikigaros9duss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5fcaa6060fc17.pdfIn PDF document text
    • http://setofexperience.site/sapomiforunobuvaditurekaw7ni06.pdfIn PDF document text
    • http://shtangye.xyz/cardiac_arrest_and_cardiopulmonary_resuscitation_outcome_reportse2v2k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5fda3ccd8bc05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fdc4a720d36f.pdfIn PDF document text
    • http://generatorsale.ru/social_filter_worksheetoanfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fc996bc2d253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/jinx_adc_guide_season_8.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/79562974708.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/marvel_future_fight_reddit_beginners_guide.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5192 bytes
SHA-256: e299ca604e9ea3ea422f81962ef67a40092f0f080576fa8550c3f3af4e2f89e4
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 11044 bytes
SHA-256: f02851b2bafad4390fccb89f5c27b27defe03e3554f916b6cfa6907bffdbfa97

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