Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa42321991cb990e…

MALICIOUS

PDF

71.9 KB Created: 2021-02-09 11:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5f0610fce4f3af272807abef6de83156 SHA-1: acc90bb475811d3bb14b6976a6da8a32cc70bc01 SHA-256: aa42321991cb990efb5624917a7a575fcbffe7a3341ca850aee9f51b0b575861
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://leonvi.ru/123?utm_term=badger+clark+children PDF link annotation
    • http://gopagagoraxu.22web.org/guided_tours_sintra_portugal.pdfIn PDF document text
    • http://idealica-italiaoficial.site/old_jaani_dushman_movie_songs_freez0efl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fd149ffbabba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_6013ca198bc25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_60155d0710f97.pdfIn PDF document text
    • http://edayafar.xyz/13734710342mc1ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_601db34490e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/idgjghM/kolo_a_color_maze_puzzle_answers.pdfIn PDF document text
    • http://douchely.xyz/player_unknown_battlegrounds_pc_apknx40m.pdfIn PDF document text
    • http://daating19.site/shootout_at_wadala_full_movie_watch_onlinezvuqt.pdfIn PDF document text
    • http://emirofficialzm.com/gogifutivivofuvo3i6dx.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/3355903.pdfIn PDF document text
    • http://bozazareter.iblogger.org/clinical_psychology_science_and_practice_author_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/gi7hdie/doliditibobolobelaxal.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://gurebuvijo.epizy.com/working_of_2_stroke_diesel_engine.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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 4736 bytes
SHA-256: 9baa9f0a9b05bfe6611b098d44357fc4cd6698030e0b2c43acd7166aa600f809
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10728 bytes
SHA-256: 9afcf062f56b6adba969a8601578ca450acf1333e449396c016501ef57a8aac0
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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