Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cc764d3176b72b…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 16:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fb505a5016d116d9adc49173d76650a6 SHA-1: 2429b52d51fb5c87e064881bb4f702184d48f546 SHA-256: f2cc764d3176b72b4fdbe7c2fb9b55af5066a32a2ee275731f75e1c00317c31c
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 embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=elapsed+time+within+one+hour+worksheets PDF link annotation
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/69b46ac3ee01.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/jwMfYjf/cute_hairstyles_for_medium_length.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/livosupivejo.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/tipemanivepereruku.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jFXWjaQ/zero_city_zombie_games_shelter_base_survival_forum.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/pomibazok_sekusabe.pdfIn PDF document text
    • https://bovuxubirike.weebly.com/uploads/1/3/0/7/130738735/8bb1e1465222b4b.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/hcv_capacitors.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/uhgijBL/85527234530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirafabitibabik.rf.gd/graco_nautilus_snuglock_3-in-1_car_seat.pdfIn PDF document text
    • http://garulolit.rf.gd/wenokomixivelovivujabatej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c78eb5c-f974-49b7-81d9-2cba0c395dd3/18260039322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a060ccc-7ae1-4ea4-bfef-18e2de8c5c3c/weluguxuzepenoturalo.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/blood_pressure_by_age_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a0f679-7458-431d-a204-205664728d15/9411332146.pdfIn PDF document text
    • http://lesodabat.epizy.com/satibitiwimefafavalam.pdfIn PDF document text
    • http://dixaxag.rf.gd/89663340229.pdfIn PDF document text
    • http://dujenovonufu.epizy.com/disopojixozobe.pdfIn PDF document text
    • http://gejagixuz.epizy.com/35029595415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d842a102-07af-4a7e-8560-09efccaa872d/majupijazopuvigar.pdfIn PDF document text
    • http://dulubuli.rf.gd/30946702338.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/81682332197.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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 5312 bytes
SHA-256: 60f8c9db7a14de4ebe7086073eefc3ecbd2efdd3ecdaa89db2885cf6009fce6c
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10492 bytes
SHA-256: 9308296dcd5ef7bc47177e948af58b73ca16021ab3d6b88bf3f4ff57b1be2ec0

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