Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce233750d8b852f9…

MALICIOUS

PDF

77.1 KB Created: 2021-02-21 06:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ffd4277748d92269da7cc68b4174e7cd SHA-1: bc3f91766efa0488b8606cdd26211c5d2fc6c23a SHA-256: ce233750d8b852f9fe1ad83c9dd7700630059ca24ab7674f05ebf85312161fef
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru' and another to 'acgmgroup.ru', suggesting it functions as a link farm or redirector. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in automated phishing campaigns.

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/wix?keyword=realidades+1+capitulo+7b-5+guided+practice+answers PDF link annotation
    • http://acgmgroup.ru/61541327212isczp.pdfIn PDF document text
    • http://gazorowegesejix.22web.org/zeletufutogafijenef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6003c1da12d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_602fe23cd9752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6016706a887ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5fcf85522969a.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/1kibqhe/92986056962.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/independent_t_test_report_apa.pdfIn PDF document text
    • http://goromeo.club/free_beginning_cursive_writing_worksheetszpw4v.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/bee_movie_full_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/CAEghie/21440665962.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/eTcweGf/download_stickman_fight_battle_shadow_warriors_mod_apk.pdfIn PDF document text
    • http://namedaun.fun/computer_shortcut_key_in_hindi_download5kwon.pdfIn PDF document text
    • http://solapp.xyz/android_messages_rcs_australiak1foy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizubirusetidi.rf.gd/wilabuxol.pdfIn PDF document text
    • http://givonomiruf.rf.gd/tiwaki.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/easy_printable_math_worksheets_for_kindergarten.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5768 bytes
SHA-256: 67225a235775066f61e9cd3f7733e40575a6c11f12d860451820b6c7fcdbd58a
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10276 bytes
SHA-256: 1295d59240078fd940d6845ead290f9c1bb532d1060290af3c60080b9f91099a

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