Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc06baf92daa7a29…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 06:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 641b07a15daff28bf2737d21f37a78c6 SHA-1: 2329b7710eccccdb41ce5dc433c4f1676d39ef85 SHA-256: dc06baf92daa7a29071946461739e8e271df5d195268997c642e2213ecbaac59
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, some pointing to disposable hosting and utilizing UTM parameters, suggests a phishing or link farm tactic. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/pbw?utm_term=dell+latitude+d630+bluetooth+driver+windows+7+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b66109c49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60150d6244ab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371807/normal_6006693231809.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369772/normal_60b5b4356e776.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480750/normal_60aff9df8d475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60b8793532bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_6019778473bee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufukamapaf.pbworks.com/f/is_deathly_hallows_part_2_the_last_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79aff94e-ff63-44f6-b7aa-654a7c7bafc1/34635305353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be63f770-c597-478f-84a3-15a8f085641f/838465662.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144418989/easy_worship_guitar_chords_and_lyrics.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144432141/xupemub.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144538533/balasaheb_shinde_marathi_vyakaran_book.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/mejurabagojusepi.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/w/file/fetch/144696807/descargar_dragon_ball_z_budokai_tenkaichi_3_version_latino_wii.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144691251/66563416052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c0b37c-0097-466e-ae72-c4a55c340354/programa_de_traductor_ingles_espaol_gratis_sin_internet.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/diggy_2_hacked_unlimited_money.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5828 bytes
SHA-256: 048fe9ae8b9125e94241682773f6d5e96c5800d2e3acc440b0ed61576c299df3
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10640 bytes
SHA-256: be49ed510c3692b783e994378bfcce8745501cf52e07ecb19a7459536c406b57
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90