Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9459ad89ca829e…

MALICIOUS

PDF

133.5 KB Created: 2021-02-23 21:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0050b10d2142d30c63b9eaac78982d05 SHA-1: 5d4a3d6740c20adb14163aa8edfe24bb9c892640 SHA-256: 2f9459ad89ca829e2a6e4e77d0a9fd6033d8d263d5398fc032fe79328c46ec88
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('bologen.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a basketball system manual, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=spalding+portable+basketball+system+44+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387716/normal_602fc3b95c230.pdfIn PDF document text
    • http://wikurabafewo.iblogger.org/make_stock_inventory_report_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/MLyihFY/anime_live_wallpaper_hd_4k_apk.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/jiwonaxo.pdfIn PDF document text
    • http://namekegosanobus.22web.org/79964061796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://woporebokut.rf.gd/interior_designing_jobs_in_navi_mumbai.pdfIn PDF document text
    • http://suzogoga.epizy.com/sims_3_update_patch_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/4209705546.pdfIn PDF document text
    • http://xoxiposewarewa.epizy.com/maplestory_2019_training_guide_reboot.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/cube_world_warrior_guide.pdfIn PDF document text
    • http://laburebimefifal.epizy.com/74016201880.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE5F 5656 bytes
SHA-256: f27ff8ec4caa36bf563633976a4c28ea50f78ce1aa527c379bcfcace5c054a90
font_01_sfnt_off0001d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D186 12888 bytes
SHA-256: b0a09c4a6a37e0365d79eda2772ab49ee14e8d0a8c8558a7452487c713e1c754
font_02_sfnt_off0001fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAD3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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