Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a276e922882a5a4…

MALICIOUS

PDF

59.1 KB Created: 2020-12-09 12:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f0e88bddbd791ecdc6691d042436ac9a SHA-1: 2540c0179a7ea1a17bc362b2d81c9f8468547a0b SHA-256: 8a276e922882a5a4489041b6c8bef8b182fab5310205ec1f71999070f034d255
176 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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 59 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://trafffe.ru/strik?utm_term=contrast+the+terms+ecology+and+environmentalism PDF link annotation
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/niwekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fc116916c979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fa45c3f15515.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/zupenafud/equate_gas_relief_and_prevention_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f45568c-4a3e-45c4-95c4-5e127a69aec3/yan_cmle_ne_demek.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/amanda_hocking_switched.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927be96c-7e0c-42be-8fa0-6e0d273d2343/41664233674.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc177dbbf71053ccb142dd9/t/5fd09dc40c0c9b10ab0c4b93/1607507397717/bad_company_live_five_finger_death_punch.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3805b3dfdd95b60e588d7/t/5fd0672f75f5e504857126d4/1607493424094/rap_beat_maker_program_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdf4e51-3647-47b8-8f64-4b88d54cef7d/62635761515.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd745bcb0228a2824d01/t/5fc55f356457125654f000da/1606770485797/famalixavarazidobebadod.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/fovaladesavijisatemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d4b5aa-80da-4347-bee5-c036d46d9f51/lyme_disease_map_usa.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 5420 bytes
SHA-256: 13fbee04e7caa0bd205b8d2966a83ba559a97a851d2f2ff6388e5090e1468036
font_01_sfnt_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 7760 bytes
SHA-256: bfc2e27f6ebfba3697cdaca699672d8799ae3d752822a8d2f41af533a6a1ee8e