Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cafb22fda6b8839…

MALICIOUS

PDF

87.7 KB Created: 2021-04-10 15:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d7ae646ef42ab6a4e1d53bcea3901c52 SHA-1: 2fbabe1e35669c888ddcfd8d2da2fdc4928be1a5 SHA-256: 7cafb22fda6b88398fce12ae06790b10fa55687f5bf5d44378f376ca38996571
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The 'DOC BODY' content, though heavily obfuscated, includes a reference to 'Maytag 2000 series washing machine review', which is likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=maytag+2000+series+washing+machine+review PDF link annotation
    • http://powuvomewekuxeb.getenjoyment.net/83310311444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_600f9dbaf0d12.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/pezigewilafujuvogaz.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/bully_game_free_for_android_mobile.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603a5a8573733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff1d2f4dee4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_356cc5ee9ddf415d9f400a7a1afa28df.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_fad9be9aa47647c4bf0b7cbc17ba2148.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_587f41be1e334e47973c3ed53c29def2.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_89038acd1d53422ebfb814d832b31895.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_ca5904d127a2423cb2f745bb4028ce7d.pdf?index=trueIn PDF document text
    • http://gevapugono.atwebpages.com/sensation_and_perception_in_psychology.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_c39c411316c14d4db406f029a9149b45.pdf?index=trueIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_7097f5b0446c427582f960481c5876b3.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_bc78ef25db504639814dd12adfdc8ac3.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_6b0a32745ada43bc93011440856e9d61.pdf?index=trueIn PDF document text
    • http://luvewon.epizy.com/asia_political_map_outline.pdfIn PDF document text
    • http://duziroro.myartsonline.com/libros_de_tecnologia_medica.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_bfd8ac05dbaf43d8b6ebe777308acec4.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_45e8989ca3a1452482a28c6421a41491.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 5716 bytes
SHA-256: dfce8cce3f9856398834a0c6072e825385bd654e177edcf815af913877d6727d
font_01_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10816 bytes
SHA-256: 39358f0b6a481058ec4734c2b2b3c6b619e734eaa4f173bd99a9f508195089b7
font_02_sfnt_off00013bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEC 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f

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