Malicious PDF — malware analysis report

Static analysis result for SHA-256 957bda33b4ae49f1…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 15:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 691955b5bac6ada3ac35b3aa615b9302 SHA-1: 38eb72f1c8c68436fab2b0063c03d0cb373fb96c SHA-256: 957bda33b4ae49f15533d491286a8f2d5fa7c79021bac0f1b2205c224bfb3d7b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm heuristic further supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=words+with+r PDF link annotation
    • http://funseeds.site/novolukabalodenanonizejvffue.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/tegotebokurewejawasomuw.pdfIn PDF document text
    • http://mini-cam1.club/petsafe_shock_collar_rfa-417_manualg9g9y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5fc69250eb947.pdfIn PDF document text
    • http://wativeb.mypressonline.com/abellio_greater_anglia_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_601e52027f920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ffaf071a0060.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/merits_and_demerits_of_cashless_economy.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/the_monk_matthew_lewis_quotes.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/sadogatakejafiferijigimuw.pdfIn PDF document text
    • http://topsale.pro/samsung_smt_c5320y2014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fd8f7a29e8f9.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/29e41c9f-1a6f-4f5c-92bc-d4a4282dfbc2/barnett_vortex_hunter_compound_bow_19-45.pdfIn PDF document text
    • http://tabewozuzigenog.epizy.com/az_drivers_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dbbc9e-9b36-4938-9085-99480ca47baa/91791375913.pdfIn PDF document text
    • http://jixabedumusuzet.rf.gd/os_melhores_livros_de_dostoievski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b32f49-63aa-455d-9ed5-627126175099/tudebotatamosig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d8c154-5f2f-49c9-8d91-5e85dc8bdf76/roland_micro_cube_gx_vs_blackstar_fly_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6655837b-6a04-456d-8c08-08af8d83a41e/gametorate.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 4776 bytes
SHA-256: 8c5d7f0c7975b6a1ef3c3d83f37260a9a2f18d6ef76bb0523a184298a17accd3
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10452 bytes
SHA-256: 45db24f70b32c18312b09449c8f0c6d64126a1cbff3695fafacc8eccf1ab13b0

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