Malicious PDF — malware analysis report

Static analysis result for SHA-256 397d039d9dd2c4bc…

MALICIOUS

PDF

85.1 KB Created: 2021-03-13 21:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0444c45085f4bf91b0424a9b4346d905 SHA-1: 6401a48e2b49e8e9004c29055856e3c6fdd1a3a2 SHA-256: 397d039d9dd2c4bc799e909bd2c53db745cf0109d1dd58ea437f7fd58804ebb5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to malicious domains such as dafemum.ru and koropiliful.weebly.com. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content, potentially as part of a phishing campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=brother+mfc+j5910dw+no+paper+fed In PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/4972828.pdfIn PDF document text
    • http://instasurprise.online/dungeons_and_dragons_5th_edition_torrentyxk8v.pdfIn PDF document text
    • http://watertea.space/simelopazenoke30lkl.pdfIn PDF document text
    • http://wide-do.top/tw_warhammer_2_bretonnia_guiderlxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/r3hgxgd/new_york_city_comptroller_audit_reports.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/how_to_tell_if_jlab_headphones_are_charging4633b.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/1034036.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/eJhgRgf/denon_audio_delay.pdfIn PDF document text
    • https://cdn.sqhk.co/xepiriza/bQ4Y1JT/50199202191.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/at26jfi/46220238686.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/60211125548xvszq.pdfIn PDF document text
    • https://cdn.sqhk.co/jakofawesavo/gQicjdu/monster_energy_supercross_game_1_or_2_player.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/zemigiduwagafu/luratelijofupofon.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/vedavimapira.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/adobe_sketch_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/zonuvisufubiwafodotilutu.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/sorapovetopiwobamapuxo.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_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 5876 bytes
SHA-256: 6273ff62d1fb89ad76245226f6c8719c8e984731415d4e8fbb23b52edf2d2748
font_01_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 11292 bytes
SHA-256: 65dfbb1deecf8f359f8192ab4dabde7ee439fa3a1d6e4897dd2db61afad2b23f

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