Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b9e791cb316c1f…

MALICIOUS

PDF

85.0 KB Created: 2021-03-04 02:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8773f3144543458c0af183f75c8f597 SHA-1: 27994fb707aaff2cb9966f18696c1068b098849d SHA-256: d3b9e791cb316c1f2a41e83ed5770beb2907b50f0f1b4e9fa2aa39e734d7e73e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=normal+distribution+table+negative+pdf
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fc7cce2cad88.pdf
    • http://xuwuvewisin.mypressonline.com/pivezema.pdf
    • http://tijudiwulewanuw.getenjoyment.net/gutufujaburiledax.pdf
    • http://waferaboteb.mypressonline.com/guerra_de_guerrillas_mao_tse_tung.pdf
    • https://cdn.sqhk.co/giripiponi/FDjNgfr/ps_vita_remote_play_keeps_disconnecting.pdf
    • http://nadipewin.mywebcommunity.org/princess_diaries_2_full_movie_english.pdf
    • https://cdn.sqhk.co/tinipuded/aggCKhh/auto_clicker_download_for_ipad.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/ca34e.pdf
    • https://cdn.sqhk.co/vibisidumes/iMyharE/mukakos.pdf
    • http://9gusevshop.website/photo_collage_editor_online_free_downloadx3vub.pdf
    • https://cdn.sqhk.co/vobevufubito/gecgfb0/88088363690.pdf
    • https://cdn.sqhk.co/xewafazuk/gAogiie/28359137595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tediguku.atwebpages.com/manokaxibaba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff6.bin
7fda3ba8112a652427c1d01c2793785762532f7ce2c85b8b41b92d4624ba8f72
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 5412 bytes
font_01_sfnt_off00011249.bin
6c4485f501baf7946cf7ed8b0b36d70d549b0549501dce8a23b243e9d241eb5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 11256 bytes
font_02_sfnt_off000138ac.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 4324 bytes