Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9df049ee6f1b697…

MALICIOUS

PDF

73.4 KB Created: 2021-03-10 15:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af88aeb6bb2b9262c1225b0647cf2a6d SHA-1: 8c9cce489dc61f60f81d4cbfb7f5a40c20fc0d6f SHA-256: c9df049ee6f1b69766468cfde4b7b4773825cf6b448998deff5029504c065967
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to technical documentation, likely to trick users into clicking the malicious links.

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://jacksth.ru/strik?utm_term=different+types+of+earthing+in+electrical+system+pdf
    • http://fejofezipekow.iblogger.org/rita_mulcahy_pmp_exam_prep_10th_edition_amazon.pdf
    • http://vitofemegawe.getenjoyment.net/61088487500.pdf
    • http://neximegimukik.iblogger.org/wewegi.pdf
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ffd4bf4b6d9d.pdf
    • http://vizilirudigub.getenjoyment.net/kaxilu.pdf
    • http://lomuwugevona.getenjoyment.net/genesis_1_26-28_esv.pdf
    • https://cdn-cms.f-static.net/uploads/4376126/normal_601de64d296ff.pdf
    • http://mojadejazisapa.sportsontheweb.net/jivudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buwaveb.rf.gd/kaliningrad_tourism_information_centre.pdf
    • http://ritumogadoj.onlinewebshop.net/84293705354.pdf
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_043e58cad26c4cbb92d4b4fa6c8a778b.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b9770954586f4dbf9d2f998cedac4933.pdf?index=true
    • http://kibowetesuve.rf.gd/aptitude_test_questions_for_engineering_students.pdf
    • http://nadefivetokilak.rf.gd/jumosobetowiranoxuviveb.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c3378e0964df41b1803514a116a5eacc.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_b6eb4d64c2c94c249a74b090c34f85a0.pdf?index=true
    • http://repuvamiperubo.epizy.com/nhs_back_pain_exercises.pdf
    • http://golemibafub.epizy.com/what_is_general_to_specific.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_off0000e18b.bin
21951b11d39857b97799b57c2c242918f20f094a321ce8861a921fc5afd699ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 5672 bytes
font_01_sfnt_off0000f4c2.bin
c927a192fe35676ca78ac12ef29c3eec01e12d6d8c68c6c3c9a2ddaeb604d839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10540 bytes

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