Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bf01e54dccc940…

MALICIOUS

PDF

77.0 KB Created: 2021-04-06 15:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 847917a98741bdb884d3532d182e6848 SHA-1: e95dabd4b23293fce0fd76606ed62fc192e460a3 SHA-256: b6bf01e54dccc940a938ee66d25898f66ab3c326729cea581a8d83a8f8790f81
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=active+and+passive+voice+pdf+class+6
    • http://zespodsvetkoy.site/zorilulowirilabancn2r2.pdf
    • http://stroy-level.ru/how_to_pair_sonos_speaker_with_iphone49ywe.pdf
    • http://rapegutuxipik.22web.org/zaber.pdf
    • http://artrosil.xyz/15_tipos_de_dispositivos_de_procesamiento_y_almacenamientooc44d.pdf
    • http://axecheat7.xyz/pfaff_sewing_machine_parts_replacement_ukzzl1m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_9b0f0ca8a54a4b11a9d640463acb6aa0.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_d2897fd8c63341138a83ec7a25964a14.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_59bbce1037634383859c8612208abe3d.pdf?index=true
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_ccc286b701c3402f8e59c9986d24698e.pdf?index=true
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_3b448f6b45a74a2c8cadf6b598453a62.pdf?index=true
    • http://nawatelobuj.rf.gd/xapivobipukapefisijede.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_fee9c1ac645547b3922bb368f6f182a2.pdf?index=true
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_c735cbac604f4f23be17295419eae34a.pdf?index=true
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_bc4f6af0357f475aa93d3958029ee8ac.pdf?index=true
    • http://ruriwujuvuwa.epizy.com/79038191683.pdf
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_f1f5fd6aaf1a4633b3b8a35991a0e6fa.pdf?index=true
    • http://jimomug.rf.gd/bible_journaling_ideas.pdf
    • http://filivuso.rf.gd/tablet_rca_voyager_pro_7_caracteristicas.pdf
    • http://zasejaruzakir.rf.gd/password_protect_google_sheets_document.pdf
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_d5dcbd0d58d54f1abe4bedb027257ab3.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_b8955cecd9ab4a49b77fcb85790a78a6.pdf?index=true
    • http://mopufeva.epizy.com/xupakuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7b.bin
a3d95c6a64da53949f2f8bcc8f188327dbc24dd9b28b4b0e2991a213a5a5945d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 5256 bytes
font_01_sfnt_off00010181.bin
7f2fd6f93e9ec75a143f78b17d1e272469ecc01ef5427c6b330d9901a7095f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 10852 bytes

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