Malicious PDF — malware analysis report

Static analysis result for SHA-256 029b6a6d86c60c15…

MALICIOUS

PDF

75.9 KB Created: 2021-03-08 08:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b1b908616e381ce721a5b1010715a7 SHA-1: dd95a58e29521cd0f9c660be504edc0749a8e920 SHA-256: 029b6a6d86c60c15233ee1d42df74582552414bb23bea9c01417605f0a2bfc6e
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic findings indicate an attempt to redirect users to malicious content.

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-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://ponafet.ru/123?utm_term=how+to+use+oil+filled+electric+heater
    • https://cdn.sqhk.co/poronujefino/8bSibif/brightspace_pulse_app_for_pc.pdf
    • https://cdn.sqhk.co/xopuxuvop/hSmFcPO/sniper_shooter_3d_hack_download.pdf
    • http://drnextact.xyz/how_to_use_canon_mp21dx_calculatortttsn.pdf
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5ffd6610d1451.pdf
    • http://rekijiwowak.scienceontheweb.net/tozisevipikufemumumefixi.pdf
    • http://gufutaca3.xyz/shooter_jennings_new_songs74lyo.pdf
    • https://cdn.sqhk.co/jowoluguwoge/gfvyxvF/tumblr_girl_aesthetic_drawing.pdf
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/tifip.pdf
    • https://cdn.sqhk.co/felatadag/ihugisZ/koala_bears_chlamydia_one_direction.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/nubolewel.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5fd3104bbbcbd.pdf
    • https://cdn.sqhk.co/baruduwege/xhgKAjc/49742892756.pdf
    • http://rasipafus.getenjoyment.net/7600364164.pdf
    • http://tulomodev.getenjoyment.net/what_is_development_biology_embryonic_and_fetal.pdf
    • http://gagimubu.mywebcommunity.org/76405341742.pdf
    • https://static.s123-cdn-static.com/uploads/4366633/normal_600471572dac2.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_603249d17d408.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_d8af15a3e0494c68a2611b3ca41275bb.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8571fe70f6514e4e883a30edc26b3ce6.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_9f9235c66c29405d83e141ec00aa1023.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_off0000edb4.bin
8d735d491106b55692f04b7bfebc5e3da607e3f3657e45b9764059468896c204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5160 bytes
font_01_sfnt_off0000ff4e.bin
9a7fd0d42fc176bef8318af25fb47922ce2aa9840b173fadefe501c1667ec376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10208 bytes

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