Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bfa0eaf0f698df…

MALICIOUS

PDF

98.3 KB Created: 2021-04-19 11:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 813c276cb9641d500526f5202b6f0ea5 SHA-1: 1e2a5d9a9aecd058886cf14341793d03bc891004 SHA-256: d4bfa0eaf0f698df4532c9c21d0d5cc2be8270cbbd4921dee52656acfd33b0db
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=wall+street+journal+suspend+delivery+phone+number PDF link annotation
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/c2136faa.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/ac4ec.pdfIn PDF document text
    • https://bexoligimes.weebly.com/uploads/1/3/4/3/134314561/barusa.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/85d106.pdfIn PDF document text
    • https://zakikewamipuvew.weebly.com/uploads/1/3/4/2/134234925/5555c7cea3796.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/fjhjfgf/topalemadekawimirujuzuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/gfXRgfZ/batman_the_enemy_within_shadows_edition_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/qhhfCjj/format_of_experience_certificate_from_current_employer.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/WqUjjmb/turujokegumoxinali.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/Lhi5hfY/bombay_movie_kannalane_video_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f6271b2fb25b4761964ab2ffe17fcd46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b8f218-aa34-4b08-b08f-76c5b628bfc2/bapemudumelativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c7a1e8-ebe3-4935-90a2-db165eb9c81f/domezojakivopuvul.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/wolajuz.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_9c1e76e725f64006b35f844b4b3264a8.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_b16743249fa140a48f0989e992e990fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/136fd8e4-5317-4a91-a56f-5edadf53af85/how_to_enter_promo_code_on_pokmon_go_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/97973180722.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/2012965465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3981de-2860-4b37-a16e-46919f90b73b/67695631390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275ef8c6-244b-426c-92a5-d48a3065a28d/geduxugutofegikibevun.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_5b0d81eab207444780ae332e62bca59f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ceaae7-f447-46c8-95f5-97a64ed79dc7/simademozixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd6313c-cb11-441b-8f77-4def1b23cf9f/34688062168.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_off000140f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 5592 bytes
SHA-256: c4b051c495beb9f36c82e7a4228cba89a298f3dac43535598386e2ef65aaa25c
font_01_sfnt_off000153db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DB 11816 bytes
SHA-256: 5d2b75bb773daad4a4ae411cfcbb041b2b43050e2f0ce9c2fd89cf23cb3d4c29