Malicious PDF — malware analysis report

Static analysis result for SHA-256 896f59e22b509ccb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 12:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e60fba7060c28f1457aeb1756829e86 SHA-1: 74432519e806223e9197a616cd9ae08e9482555e SHA-256: 896f59e22b509ccb3f39a3d55ade52094dbcdad8dfede27e875409b2188cb50c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

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-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://midufefew.ru/wix?keyword=siyi+zhang+math
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/97afbf055ccdb4.pdf
    • http://sijixobepavip.22web.org/dinugitexejibamo.pdf
    • https://cdn.sqhk.co/rapigufagi/bjbjeO3/fly_birdie_fly_up_up_to_the_sky.pdf
    • http://halfraire.xyz/8501313301658rfq.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_60314313c9829.pdf
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60469c52346a3.pdf
    • https://cdn.sqhk.co/faroziwe/gfAhjSU/buzzer_beater_nba_live_mobile.pdf
    • https://zapubotugor.weebly.com/uploads/1/3/4/6/134635013/pevuwamelowut_rejigu_tilekujinigoles.pdf
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/sedip_tagaj.pdf
    • https://cdn-cms.f-static.net/uploads/4497071/normal_605303e7132ab.pdf
    • https://cdn.sqhk.co/naritiba/ARhghiw/76777978260.pdf
    • http://trickyturkey.com/suwezenologikebonavitozbfvf.pdf
    • https://cdn.sqhk.co/pibilebomek/dihh64p/lufodisubijutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lawigut.rf.gd/how_to_use_omron_blood_pressure_monitor_cuff.pdf
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ea663e98922447a8899afb383b6c1611.pdf?index=true
    • http://rawodofomer.epizy.com/54534373378.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_ef99fa286e6944c39ce603d857a72e96.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_4687dace96c14b3aaeabf3f9908a1651.pdf?index=true
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_c36d329061894eb48f6a8ffd5fdfc6b8.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_off0000eecb.bin
d21382ae72664acb29f89e5c4587567b9425e97ed26ad8bcb8b0b7f4bdc25056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 5048 bytes
font_01_sfnt_off0000ffe9.bin
64a8ac1ac1a6f40f7e9f993efce61e853d369e035212c6dd5a5205ad33041832		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 11788 bytes

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