Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0201f5de6f7740d…

MALICIOUS

PDF

70.6 KB Created: 2021-04-01 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9d74d2e28d14d815ac07fa81e72293a6 SHA-1: b0a41aa4219fc372b73eca9f87ca1adc68589fa7 SHA-256: b0201f5de6f7740df17354cd84cea78f986f4dc65ecd72fb12cd88387ff79dfc
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with several pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=bosch+shx46a05uc%252F23+manual PDF link annotation
    • http://reduslim-italiaufficiale.site/affidavit_wording_templatetp80a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451206/normal_6009088dc3e23.pdfIn PDF document text
    • http://itclick.pro/leader_vs_boss_quotehjn39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_5fd22db18ff9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60054975b2146.pdfIn PDF document text
    • http://biomaniks.website/57355365298x00ct.pdfIn PDF document text
    • http://usesol.xyz/74080361204wb3as.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6043bfcb61669.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://prechambre.xyz/wawowonacjdaf.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/00db84cd-5930-4917-8bed-a8fba44d99a0/450664492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf14d719-3dca-4ee1-938f-17707230d779/98643425036.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_4ca0a07a9a5c428d8b492a642d794321.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6781f154-86cf-4d33-8d0f-4361f9fefdc6/where_can_i_buy_a_pizzazz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8201f131-9109-47f9-905e-5102e01c08a3/what_are_the_basic_principles_of_social_psychology.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_a3f8b9a120fc4d3ab65b4b9ad349bca2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/293678b9-8c2a-4e19-9a8f-92acae27a30d/medizovibufoponusevuze.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_b107706f2c274ee497dac1d3ecdbefd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c703c8f-8164-45df-889e-11854badb771/dna_detectives_autosomal_statistics_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac87a7b-db0d-437f-8558-6b83268b9108/world_inbox_history_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9113b01-c1e7-4cb7-91c1-1bbd0488d1a9/9846785532.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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 5900 bytes
SHA-256: 43e40e32d53e84856d53c3fcd1a61aab646462daab8503a16f600767fef280f0
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 10736 bytes
SHA-256: 3ae7280320093acfe1d725f7ccb6a0c6218f97f5a2c2b9887a872774a35930fa