Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2d579cdc2dbf39…

MALICIOUS

PDF

77.8 KB Created: 2021-02-22 01:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2e4e2c3ee4779271721a3bc85a177969 SHA-1: 77260a4e289edbe592897aab9b4601343201a477 SHA-256: 6e2d579cdc2dbf3904644d99eea1385dd269260dee7b6048de048d9a97f4d750
126 Risk Score

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 external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=free+chilton+library' in one URL indicates a lure to entice clicks. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via external links.

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=free+chilton+library PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5ff682b658832.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/gjgeaId/24913897468.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/RJiifig/download_game_badminton_league_mod_apk_android_1.pdfIn PDF document text
    • http://renakuw.iblogger.org/24702757862.pdfIn PDF document text
    • http://xuridikak.22web.org/wetawakirimubowurisuboxa.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/AHickhg/north_star_mall_hours.pdfIn PDF document text
    • http://wesifugutedif.iblogger.org/merumatex.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/jhcEhgf/the_crossings_sacramento_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/izjgtKA/muntaz_halilintar_wallpapers_4k_hd.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://nexuvojof.epizy.com/rikilelevibuda.pdfIn PDF document text
    • http://lanikudawojag.rf.gd/52138711964.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/4230232285.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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 4692 bytes
SHA-256: f1565db8adf32da7e8ecdffac28aa39df8c7cb02053baae552f30e0017520520
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 11056 bytes
SHA-256: fbf739f1f796aa4b416eb1ce91467d038122be32ac2ae50871aa5d676a646139
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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