Malicious PDF — malware analysis report

Static analysis result for SHA-256 a935b30bc0c0d365…

MALICIOUS

PDF

66.7 KB Created: 2021-05-18 14:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2de46a7f34b86c07ddbe6f6b73e58b35 SHA-1: 1acebdaaca871ef71e478bc06fb98d91c35ca7de SHA-256: a935b30bc0c0d365750c2e0fb9972dab8847f87dd28d569a6884a421e933aadd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential phishing lure disguised as homework answers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://soxebez.ru/strik?utm_term=unit+6+radical+functions+homework+1+answer+key PDF link annotation
    • http://gunisone.iblogger.org/46862359125.pdfIn PDF document text
    • http://zoxifowivo.iblogger.org/valizusiravonenatitawegob.pdfIn PDF document text
    • http://muxufeguzugebu.iblogger.org/how_to_write_a_chemistry_lab_report_discussion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rudufegasavu.rf.gd/best_michael_jackson_dance_performance.pdfIn PDF document text
    • http://xogowiv.epizy.com/mixogedisuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/clash_of_clans_online_game.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/refuf.pdfIn PDF document text
    • http://setevibebevu.epizy.com/conceptual_chemistry_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4579409e-8e73-42ea-a0f3-a9f6220c5275/marshall_guitar_amplifier_as50d.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/xufedukowurukogoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1e07fc-6fcc-4383-b6de-a52a02b7d401/xopigisesisidofekikaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4558b4-4bad-464a-8eb8-020e09922a0b/87199123273.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/66995837699.pdfIn PDF document text
    • http://pikadimakezazir.rf.gd/pre_act_math_practice_test.pdfIn PDF document text
    • http://walakokuj.epizy.com/wixozubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e86b2ca-5568-4f8c-8716-e774e50756a3/us_army_corps_of_engineers_fort_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681ad957-89d2-40c5-995d-fcd5317b2788/winters_bone_book_characters.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_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 5716 bytes
SHA-256: 57f3b795de838eb6e6f5067ace19a1b8dead6e5e02871463bdea5bcab324dcd6
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 10352 bytes
SHA-256: e14496472463584981ad2561075f2d89e3462317740a0887c18d33762c6d3f51

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