Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf89fffd154c142…

MALICIOUS

PDF

78.7 KB Created: 2021-05-22 01:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 08702ea4610282159703fe3883fad65e SHA-1: eb663ff5c93975bbfb6b052e510cc855f2ddd9a1 SHA-256: faf89fffd154c142ec81366c5658f4addbf202b5079534361c963d997d0902e5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains a large number of external links, including one to 'vilenefex.ru', suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+do+i+become+a+spy+kid PDF link annotation
    • https://lisubavami.weebly.com/uploads/1/3/4/3/134331762/petavaxutop.pdfIn PDF document text
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/roxaxoxobifi.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/doxotami-xiragemen-zotifabuxuded.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/bobawi.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/sejimenepolid-pinaja.pdfIn PDF document text
    • https://bodumiwi.weebly.com/uploads/1/3/1/4/131406735/89b6f8afd057a.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/4267296.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/bunebegulusupovatezo.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/1598022.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/loneminovu/zisolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31819e5-954d-4985-ab56-a8f34bc14025/best_comfort_bike_seat_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c47fb0c-59f1-40aa-9faa-1c85fae1dd41/69286155695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/812f08e8-defe-48e8-8341-739f45c98344/kumugopesuwuxupuwafi.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/sheetrock_for_9_foot_walls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b12a461-6a6f-40e2-8805-ca7aba3676de/viworaladaramewoz.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/cinema_paradiso_violin_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/motefinijupawalabudek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10274966-e99c-42e8-b642-4ccb5618ac03/what_do_normal_ekg_results_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff5b254-a6e7-4fc5-b058-6e1c6a6c78ba/your_zone_metal_loft_twin_bed_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdc837b-68fb-4cf5-9b7a-1ac5a0833df1/the_likeability_factor_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/83864253157.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 5452 bytes
SHA-256: 4c138699ebaff82aa47979c5b7a0b71a9886f54334b564592ee40d065d1adfd0
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 10656 bytes
SHA-256: f5c0d9f5da13da6a1d93bf567604c7945d183f6fc8bbcf4d045b76732fda61a2