Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f4f07be0b75d7c…

MALICIOUS

PDF

75.7 KB Created: 2021-01-11 08:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3c4c1391ed05a39f71b6a25af769f07 SHA-1: beac6a487d79fa0863a4a174f1c32dbbcf9e0a4e SHA-256: a1f4f07be0b75d7c7ad9067a993caac46b1c6be0e5101bdf35b9aa887de6a271
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic of using multiple disposable domains to host links, further supporting a malicious purpose.

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://trafficel.ru/aws?utm_term=blue+jackets+manual+pdf PDF link annotation
    • https://site-1174929.mozfiles.com/files/1174929/toolwiz_photos_pro_editor_online.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/hghbggK/48814419012.pdfIn PDF document text
    • https://site-1166703.mozfiles.com/files/1166703/26125137335.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/1536666.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/tejenigoleregep.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/gibgfje/hearts_on_fire_lyrics_cimorelli.pdfIn PDF document text
    • https://site-1177296.mozfiles.com/files/1177296/pba_league_rosters.pdfIn PDF document text
    • https://site-1173894.mozfiles.com/files/1173894/52743416966.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/5551274.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/aGjeX0v/free_music_player_online_mp3_streaming.pdfIn PDF document text
    • https://site-1212674.mozfiles.com/files/1212674/excellent_cover_letter_templates.pdfIn PDF document text
    • https://site-1179214.mozfiles.com/files/1179214/consent_form_template_for_field_trip.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/2fc90.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/mubefula/divide_et_impera_carthage_guide.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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 5396 bytes
SHA-256: d2e8af7429dc0af0fa044d7db478e8d9b5fadda5c98146b586ee99fb3f389c9a
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 11064 bytes
SHA-256: ab05ba4b5400dcd6a69dca5caba7a8a7298004084f4e694baabdbaf672f5d223

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