Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c431e380cc800a4…

MALICIOUS

PDF

68.4 KB Created: 2021-03-16 05:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd43c7ff60c1dd638503ee87b89f7be7 SHA-1: 5777cd5788a9e1cdeeede709507c6a14238d3ef6 SHA-256: 2c431e380cc800a4e7aad7b3467e1f3767558682bb72591f7d5fc26dee82ae60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful 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 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.
  • 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/wix?keyword=assaria+ks+weather PDF link annotation
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/figifozovazalov-futulavum-luvif.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ighbOgh/putafimejiranapuboja.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/giwenumonewaziv.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/yWEicoU/99154158863.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/Njchbjg/blackstone_academy_for_the_magical_arts.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/zsthjNU/rocket_launch_may_27_2020_live.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/beFjfSK/32292910317.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/cjetjgN/car_running_hot_when_ac_is_on.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ghjbhjT/download_ps4_remote_play_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/f2ifgh1/buzzfeed_quizzes_guess_the_song.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/fowonaxul/33270772067.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/29466234386.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/dance_music_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/naruto_shippuden_psp_iso_game.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_f25c0712566440ea940b18c244ce673d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/gbgw_arena_guide.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_60e4e2b07792434d9b407de8c444b5c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/js_append_stylesheet_to_head.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_fb45302b6a294472a996afb2423fe199.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_f4315ebfc2974bdc89d5057aa8de1352.pdf?index=trueIn 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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 4888 bytes
SHA-256: cc08dea04da444b5b1e5ef546d29d45ea26644134600469dcfe66dd959acf113
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10252 bytes
SHA-256: 80829fcb0f4daf3af66be6f40daa0c5c879b5812b80653cf5070b72bf02e4c70

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