Malicious PDF — malware analysis report

Static analysis result for SHA-256 64db3f6cf4e63ce5…

MALICIOUS

PDF

77.8 KB Created: 2021-03-02 16:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a52819ebfd74ed12c8720d811d85a6ef SHA-1: 7a5298225ab4fe287d117c13f063db98a7b877a9 SHA-256: 64db3f6cf4e63ce51bd58493d4c01c1f2ce70c127e7387f087dc60e38f5ca50b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('seumenha.ru') that is likely part of a link farm designed to redirect users. The document's structure and the presence of many links suggest an attempt to obscure the malicious destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=how+to+heat+up+sake+without+ceramic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371497/normal_601ee3b0cad34.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/wuzojip.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/how_do_i_flip_the_camera_on_my_laptop.pdfIn PDF document text
    • http://matras-24.ru/99510243917idnfl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_601135f8eb48e.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/kIgijfY/fidinidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_603bf1d2756e5.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/2009_hyundai_santa_fe_car_alarm_keeps_going_off.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/fipuroxoje_fujamavox_kakozukolo_bakebamupikawe.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/1icRijb/best_sd_card_reader_for_iphone_11_pro.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
    • https://s3.amazonaws.com/tesotiwapax/68039464017.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/wine_spiritual_meaning_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/kenodulipuxurasova.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5032 bytes
SHA-256: 06e4dbb528ced4e094a50719e850932a52ecff3a6e9f48e32edfefb844d09853
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10712 bytes
SHA-256: a479acb2f73c80669bb5abb3f7af7cc9a76e91b5e6bcaf61a095e5adc85651be
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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