Malicious PDF — malware analysis report

Static analysis result for SHA-256 50de3dca5ffb3627…

MALICIOUS

PDF

73.8 KB Created: 2021-02-02 05:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 561a3c385710f861255958b534659338 SHA-1: dadd2b5aee9701b3dcc6626f0c5c338b130c64f2 SHA-256: 50de3dca5ffb362748a3c4daf068882eb4494e930aa0bc3a0315a939bc3cac9f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to external websites, identified by heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Question of fact speech topics', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=question+of+fact+speech+topics PDF link annotation
    • http://helpverifybadges.com/negiwekebajulavii2pci.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/ihzjhge/jomigopexavividuzugetujab.pdfIn PDF document text
    • https://cdn.sqhk.co/guludagew/bn4qxdF/modern_fps_combat-_gun_strike_killing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/ejiujbH/chili_s_near_me_dine_in.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5fde789865657.pdfIn PDF document text
    • http://circleshtang.xyz/god_of_war_4_apk_download_freeyowcw.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/hgiijjh/88102696868.pdfIn PDF document text
    • http://polnews.xyz/the_butcher_1998_english_subtitleskq027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5fcdc85e9f5ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/ypVheja/21723954352.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/xjjhcL2/universal_sound_fx_download_crack.pdfIn PDF document text
    • http://tiktokhd.design/dapuloxozafizetowodmj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367646/normal_5ffc72b145211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_6014f4c687eb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ieAsjic/galaxy_watch_3_titanium_release_date.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/3080675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5036 bytes
SHA-256: 522c6f60f8796f97320f7ba6c77ee7de0ac0c6ddc8d95d1c4976594f1d774f45
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10280 bytes
SHA-256: 7712eaf0205a6278fe187e5c8e91b63a89f15934425022ddbab175c34252f4fe

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