Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a66198902fe5c4…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 07:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27e319b0df8f46666faa1f04c3404ac5 SHA-1: 79e6c275244afa402d8343cf444f6c32d8586021 SHA-256: 40a66198902fe5c4d130002fa7e99c6706fb58270d4de0eb33df519b79f2844a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The primary attack pattern involves luring users to external, potentially malicious websites through these embedded 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://golowaki.ru/strik?utm_term=graco+argos+70+convert+to+booster PDF link annotation
    • http://jakartapro.xyz/80832066053hxjpy.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/wizujuwukatez_naxupujene_fejowobim.pdfIn PDF document text
    • http://tojukuw.iblogger.org/what_causes_a_maytag_dryer_to_stop_working.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/jomojari.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/pubojokej-saboruwopikafog.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/77f6b0d16.pdfIn PDF document text
    • https://vezutubiwewo.weebly.com/uploads/1/3/4/5/134507618/divafidijel-vokal-vokudaxutoko-zidipozi.pdfIn PDF document text
    • http://makamar.online/lejometoxowupugiwarewiwovx5ls3.pdfIn PDF document text
    • http://santecmb-sarl.com/18153243804uuynh.pdfIn PDF document text
    • http://ruwakus.22web.org/janapada_geete_madi.pdfIn PDF document text
    • http://topcabinets.xyz/nordictrack_elite_ski_machine_manualdm0u8.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/73b291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurafoga/free_coin_games.pdfIn PDF document text
    • http://dinijeti.rf.gd/54850785427.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/93345483418.pdfIn PDF document text
    • http://bopulamumu.rf.gd/wudinifix.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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 5388 bytes
SHA-256: 3a7bd46dbf40f4ca43bb2cca8ac66b9e04859ec092543abee8cc9308fe7cdf40
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10476 bytes
SHA-256: ac6aa181d39f4e43902eba0439bd15dab363ce30ff044d56f85949bf8ac240fa

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