Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ba9e62db2c74f…

MALICIOUS

PDF

67.0 KB Created: 2021-01-22 11:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e83a72ef3180adf2bcc31b3497e7a316 SHA-1: 21e39932e67c69a4fa85ba3977896e6ed60a408a SHA-256: a28ba9e62db2c74fd07ade579d0767c0747d48e7e0aa2daf019ab1ea282ca8fd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'trafffi.ru', suggesting it functions as a lure to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it is designed to facilitate phishing or malware delivery.

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://trafffi.ru/wb?keyword=song%20quizzes%202020 PDF link annotation
    • https://site-1174481.mozfiles.com/files/1174481/57642626881.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/edhfDA3/american_truck_simulator_2020_apk.pdfIn PDF document text
    • https://site-1250438.mozfiles.com/files/1250438/graphing_rational_functions_practice.pdfIn PDF document text
    • https://site-1178750.mozfiles.com/files/1178750/pdf_file_convert_to_jpg_image.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/aliexpress_promo_code.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/34990212187.pdfIn PDF document text
    • https://site-1177442.mozfiles.com/files/1177442/to_aganara_tulasi_mu_video.pdfIn PDF document text
    • https://site-1247942.mozfiles.com/files/1247942/aetna_claim_form_for_medical_treatment_reimbursements.pdfIn PDF document text
    • https://site-1180999.mozfiles.com/files/1180999/definun.pdfIn PDF document text
    • https://site-1176369.mozfiles.com/files/1176369/punuwumijazaminawogem.pdfIn PDF document text
    • https://site-1175154.mozfiles.com/files/1175154/microsoft_sway_newsletter_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/chhjaje/cfo_roles_and_responsibilities.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://riporem.epizy.com/22241719372.pdfIn PDF document text
    • http://riramemixezu.epizy.com/48881689949.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/bu_jhansi_online_form_last_date.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 4872 bytes
SHA-256: 0919b045bc43b23362e391f3e9350f94549a9870a890d641a2ff2ff0e5fc35b5
font_01_sfnt_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 10596 bytes
SHA-256: 5c9d731edf340f742e98554dfbb4a0d680d10e348d4a7fd8d30b3ed82bcbf6a6
font_02_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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