Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98525dec5fed579…

MALICIOUS

PDF

79.6 KB Created: 2021-01-16 13:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c2447fda908566974efb7304cc2f6e6c SHA-1: 57512000a3a5ce31e93237e2f84b02b20ab2e64f SHA-256: e98525dec5fed579ece5545a425cdd31d154dda907b7c144ca4cccba363a148e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'trafffi.ru', suggesting a phishing or malware distribution lure. The PDF structure and the presence of external URIs are consistent with a spearphishing attachment used to redirect users to malicious 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://trafffi.ru/aws?utm_term=afcc+parenting+coordination+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fd09155df787.pdfIn PDF document text
    • https://site-1242757.mozfiles.com/files/1242757/jipexapevekotaduwudajuz.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/facebook_local_ads.pdfIn PDF document text
    • https://site-1168384.mozfiles.com/files/1168384/10116034237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f91455f7bc39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5fd24fef199e0.pdfIn PDF document text
    • https://site-1179658.mozfiles.com/files/1179658/43313422862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_5fae98ec69f8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5fb2ae5c3ff1e.pdfIn PDF document text
    • https://site-1250269.mozfiles.com/files/1250269/hitachi_smart_tv_user_guide.pdfIn PDF document text
    • https://site-1229162.mozfiles.com/files/1229162/whirlpool_cabrio_washer_user_manual.pdfIn PDF document text
    • https://site-1176076.mozfiles.com/files/1176076/how_to_make_origami_crane_easy_instructions.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/kozibowisenatu/7759440198.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/biker_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/alternating_current_theory.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_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 5312 bytes
SHA-256: 139ad06af68c8ba02b32aa11625cc6a2ac109a9185f4dec0dbbfff82cebf8939
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10680 bytes
SHA-256: 5ce4cb48fffeab6ae15d94e3a2d923f910dab2b203734335f5d832964c8d62d8

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