Malicious PDF — malware analysis report

Static analysis result for SHA-256 f609037e1bacf03b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-26 10:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb28c1d33e1471469266079cbdcedbbb SHA-1: d3be6b6dec9a190def01453961a2ab7c987cfc47 SHA-256: f609037e1bacf03b2362743773fa9af695f99de45cfa15fb45477eb2f55c5141
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=sierra+6.5+creedmoor+load+data
    • https://cdn.sqhk.co/jivazufevi/Uydijjd/red_herring_origin_of_word.pdf
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5fe8dd422d642.pdf
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/1105004.pdf
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5feb3cfcb5b3c.pdf
    • https://cdn.sqhk.co/notenirikev/bhf11aO/faniginifetivav.pdf
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bb471cad40.pdf
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fd8a15476dc3.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/7431466.pdf
    • https://cdn.sqhk.co/bufilimel/ha3xtih/tatafokaneketupedibizu.pdf
    • https://cdn.sqhk.co/fufejapopunu/hggqNha/68036419922.pdf
    • https://cdn-cms.f-static.net/uploads/4500450/normal_601eeb7553d5b.pdf
    • https://cdn.sqhk.co/masamiwe/mnUhdge/jazz_piano_tutorial_video_download.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/taxukup_meluferadoxip.pdf
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fc70e27bc64f.pdf
    • https://static.s123-cdn-static.com/uploads/4488100/normal_600680226546a.pdf
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6010328fb2ece.pdf
    • https://cdn-cms.f-static.net/uploads/4377656/normal_6033cd7865d21.pdf
    • https://cdn-cms.f-static.net/uploads/4446035/normal_60199175a3251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godewumazek/60439954788.pdf
    • https://s3.amazonaws.com/remavuj/wallpaper_3d_apk.pdf
    • https://s3.amazonaws.com/lazesej/how_to_figure_out_ring_size_chart.pdf
    • https://s3.amazonaws.com/bezorito/fry_sight_words.pdf
    • https://s3.amazonaws.com/luramamelolem/angry_birds_epic_game_apk.pdf
    • https://s3.amazonaws.com/zidenigad/48524885714.pdf
    • https://s3.amazonaws.com/tinezedu/45148746096.pdf
    • https://s3.amazonaws.com/tulosa/99913997735.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_off0000ec56.bin
7197ad9a60526e2d04bffba249b9a151385c562a9854170951f890858c56784d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5320 bytes
font_01_sfnt_off0000fe61.bin
5c182ad421833fe8224790b0ad3cc28a9281922f99397457b611c7ca5e4e0ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 11156 bytes

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