Malicious PDF — malware analysis report

Static analysis result for SHA-256 670216c8e943aa3a…

MALICIOUS

PDF

77.2 KB Created: 2021-02-23 23:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8980e6c2dfbb331c26b7d9f03595cf8e SHA-1: 1b3a1267eb82a10ee22053542d973d4b65f43db3 SHA-256: 670216c8e943aa3ad54afbca25019df7e36253dd1b6564ba18d2db0953993d4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm hosted on disposable domains, with one URL containing a 'utm_term' parameter suggesting a phishing or redirection attempt. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

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://bologen.ru/123?utm_term=love+story+2019+movie+songs+download PDF link annotation
    • https://cdn.sqhk.co/marixefe/gjhjiQD/pixijukalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_602bea5200365.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/jaifWir/gaa_senior_football_championship_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/hcjhO7R/into_the_badlands_blade_battle_mod_apk_revdl.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/how_to_train_your_dragon_books_author.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5fc99797bd6e0.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/hgQdHPv/juxebolavu.pdfIn PDF document text
    • http://muduxubili.iblogger.org/what_does_crossed_anchors_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_602a71132ae93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5ff80f885b88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosivasode.epizy.com/samsung_a8000_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/swayamvaram_gali_vanalo_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/baglama_tuner_pro_apk.pdfIn PDF document text
    • http://joriboka.epizy.com/backshift_of_tenses.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/fire_brigade_online_form_fillup.pdfIn PDF document text
    • http://ruxogofirovudux.epizy.com/69366979683.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/discussion_essay_sample_answer.pdfIn PDF document text
    • http://sisubupofi.epizy.com/ionic_bonds_worksheet_answer_sheet.pdfIn PDF document text
    • http://gimapetabotoza.rf.gd/wikezumuberuveg.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/57933920304.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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5824 bytes
SHA-256: 87ca524e0e57abfc44c2fb02026eafe339e0bb125f297fd57b8a9dce580dfc48
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10624 bytes
SHA-256: c9f57fd8369d4c22e497269f6f4a02d8605f928c87e86b2ee5e5975217591ce1

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