Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bab25c4e77c5586…

MALICIOUS

PDF

82.6 KB Created: 2021-03-21 23:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b0c7809f24583cfb865682d0012f4b7 SHA-1: 2a3fc96f953e6c44a5f6f781f8f288706ea63bfe SHA-256: 9bab25c4e77c5586cf18d5863a77a3bd68a631e0ac53d6ed41942af2a524b642
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/wix?keyword=nordictrack+e5vi+manual
    • https://dewokazivefin.weebly.com/uploads/1/3/1/4/131437233/5944582.pdf
    • http://oneitshop.pro/xisokugx0nig.pdf
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601a44f56d3de.pdf
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/ribagiseza_naxelutedif_famexamex.pdf
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/gopadimusi-filetasef.pdf
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/kasesa.pdf
    • http://trylait.pro/nasb_vs_nkjv6kyai.pdf
    • http://stickerrus.ru/56812315535all4u.pdf
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5ff27b4ae06b5.pdf
    • http://ig-copyrightnoticehelp.com/best_tuner_for_2005_5._9_cumminsjcuwu.pdf
    • http://form-copyrightservices.com/365072288379kfx0.pdf
    • http://therarbooks.com/vigoradipabanejpal0q.pdf
    • http://bilkaita.space/657585604778n9nh.pdf
    • https://cdn-cms.f-static.net/uploads/4422879/normal_605424f864653.pdf
    • http://pubggaming.online/whirlpool_dishwasher_wdt750sahz0_upper_rack_parts7vn71.pdf
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/2770961.pdf
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/patab.pdf
    • https://wugaxaxelapuwu.weebly.com/uploads/1/3/4/5/134595152/2248b5ec8da4ad.pdf
    • http://milanbeach.fun/xesimogikosegeroruwoke3oz99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mevusajilitum.rf.gd/free_android_mobile_apps_games.pdf
    • http://fijijap.rf.gd/taunton_cricket_ground_pitch_report_today.pdf
    • http://vedezaduxi.epizy.com/39083609908.pdf
    • http://gidepajujida.rf.gd/harvard_university_acceptance_letter.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_off000103fd.bin
a0ac1296ecdadfa5008a490891aa16070a933f701a3353eb55b5f50ec108b455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 5124 bytes
font_01_sfnt_off00011564.bin
0da779780861a05dea1f390b885212d98dcf7ea05185a9454eca46467458cb51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 11248 bytes

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