Malicious PDF — malware analysis report

Static analysis result for SHA-256 3369b740a45e3ba7…

MALICIOUS

PDF

76.7 KB Created: 2021-01-21 16:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e2caa0ca5e1b4f28bfcd5d9b40e6fa7 SHA-1: b796d8f8bd9aafa41192b3a24909a370af72e2c5 SHA-256: 3369b740a45e3ba7c91f219574cb5c4358ed2ecc0e6728dc973d07a612fcef0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to form a link farm. The document body, though heavily obfuscated, suggests a lure related to game recipes, likely a pretext to drive users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://traffking.ru/123?utm_term=borderlands+the+pre+sequel+grinder+recipes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5ffbb0e71aaec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_5faa8072ca3a1.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/hhajchh/vubaxadupopuwenoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fce9f6d3608b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fbb239c3d841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fcc2bb0b18c1.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/kudunusetuwaverovulize.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/SfchhfR/f1_sim_racing_wheel_ps4.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/meditations_marcus_aurelius.pdfIn PDF document text
    • https://cdn.sqhk.co/lafugafeniki/jiuhhgd/warriors_game_score_live.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5fad906bcbcf9.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://temekem.epizy.com/27005652262.pdfIn PDF document text
    • http://remigesej.epizy.com/jealous_guy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/agile_transformation_strategy.pdfIn PDF document text
    • http://notijopozij.epizy.com/9248737198.pdfIn PDF document text
    • http://wilixafex.epizy.com/87919059858.pdfIn PDF document text
    • http://fufinekudag.epizy.com/hilldene_primary_school_ofsted_report.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/siluwobidevizafopirana.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5392 bytes
SHA-256: f6526240d7c9e27d3d4d1d284249594ba20ca107a2a3e2d45471f48c53780034
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10840 bytes
SHA-256: ab2b98439a2bbdc9aed1c8992f6d7fb95ea6dfeb75ebd325931d4c1ba40fbd68
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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