Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f883691fefdf4d9…

MALICIOUS

PDF

76.1 KB Created: 2021-03-26 18:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba6f8d7d7e07f17bbccd901c901d677 SHA-1: e6d7bf637e29f5913c32201042eda36971bc11c2 SHA-256: 5f883691fefdf4d9a99b809fe6a7dd3ad6275cf4f98c12ba18c506e337e96394
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points to an attack pattern focused on directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=dungeons+and+dragons+basic+rules+set+1+pdf
    • http://xosaparesuroxu.iblogger.org/number_flash_cards_printable_1-10.pdf
    • http://biwedujurar.mywebcommunity.org/gozepogi.pdf
    • https://cdn.sqhk.co/dakuwuwuzije/duvhfii/teddi_mellencamp_kids.pdf
    • https://cdn.sqhk.co/fejovuwov/iiVlTjg/91486041404.pdf
    • https://cdn.sqhk.co/kagalitisup/OidoDid/shooters_world_membership_tampa.pdf
    • http://punejew.mygamesonline.org/benogaxonarajodo.pdf
    • https://cdn.sqhk.co/bolomadu/cjanhdn/kemon.pdf
    • https://cdn.sqhk.co/najuvotuwoz/FMhcide/12174299264.pdf
    • https://cdn.sqhk.co/moxulofilose/tPjejcK/brentwood_school_uniform_shop_opening_times.pdf
    • https://cdn.sqhk.co/vopofuxo/zhY0Uib/86712454464.pdf
    • https://cdn.sqhk.co/jurugaguvedu/gZhhjcB/xikekinesug.pdf
    • https://cdn.sqhk.co/mareduviger/HieFsgd/zemif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vedezaduxi.epizy.com/online_re_registration_form_of_ignou.pdf
    • http://kibajopowal.epizy.com/xuxalexilizotek.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_75a1f7ce646c47afa881b7cd3e975f69.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3979e6323cda412fad1b4178ae66acb3.pdf?index=true
    • http://xenezipulugiji.atwebpages.com/vunutudivov.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_b0cba93abddb48338c0e31c815c97961.pdf?index=true
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_02becde178954177a28206826f7f1b56.pdf?index=true
    • 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_off0000e786.bin
6c79436050abd55947aa4306056777c13f9594c9db6e396e1dccffee6d217b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 5512 bytes
font_01_sfnt_off0000fa5a.bin
fa7cd618927c46c36e4a52c0be2d1af9eebe0cd91b18714601b8bd474b42f64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 12696 bytes

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