Malicious PDF — malware analysis report

Static analysis result for SHA-256 36342aa2e30a8e56…

MALICIOUS

PDF

96.4 KB Created: 2021-03-25 05:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 65ecb34f4247d566cf419c7cbdcda4e2 SHA-1: 01abb8ad39e4ed2453f0dfe8cf0e816e06016749 SHA-256: 36342aa2e30a8e563dffece911402840e03e09f8300d3cd3a2ec341eda416d37
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain known for distributing malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials, which is a common tactic for phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=8th+class+english+book+pdf+download PDF link annotation
    • http://blubadgehelp.net/alfreds_basic_piano_library_lesson_book_1axj7b3.pdfIn PDF document text
    • http://draiwenstore.online/45523538270dnima.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/nigeria_2020_budget_breakdown.pdfIn PDF document text
    • http://probmaka.tech/how_to_get_a_more_flexible_upper_back89ydj.pdfIn PDF document text
    • http://amst-watch-v1.club/6251538602633gb3.pdfIn PDF document text
    • http://usecabinets.xyz/fesupa3kpya.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/best_free_crossfit_programming.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49704c41-76d1-4ff2-9ebd-fdaa2fe2bf6f/majoras_mask_3ds_walkthrough_zeldamaster.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/laviroxopoki.pdfIn PDF document text
    • http://pomadepoxe.epizy.com/metiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32598b2e-1de2-4754-b8d6-a1973ea4293f/wotuxuzunikimevu.pdfIn PDF document text
    • http://jiwunix.epizy.com/2007_sundance_spa_models.pdfIn PDF document text
    • http://pefemopu.epizy.com/adventure_time_season_1_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e283a7c8-e9c8-4bb7-bb8a-1f81b3023bac/71518387582.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_ec5729e3e9894399b327096e1c4b3b5b.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_e93a4466f4824e3589a0ef0469427912.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/bixagu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 5716 bytes
SHA-256: 4ce4a886161f445e7504ff6d35cc82f8bce42039fbf2b48d366bc222e5fba0a5
font_01_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 12628 bytes
SHA-256: f44ef64fc6a417d6fdb90870e0832820849572595207b7d46f001696b2f9c581

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