Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcf35b68655b41a…

MALICIOUS

PDF

172.4 KB Created: 2021-03-28 07:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 75b7ccf06ea0a2da7331fe88583d5c24 SHA-1: ca859bc6f1d3b6a6ad561300f87439ec5c6cc859 SHA-256: 0bcf35b68655b41aeffdcdbde5ebaa4c22f6f4143863fca36249572d03ae64e9
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to programming topics, likely as a lure. Numerous external URLs are embedded, many hosted on disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content or phishing pages. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://botokaw.ru/123?utm_term=programing+in+python+3+pdf PDF link annotation
    • https://jofomozali.weebly.com/uploads/1/3/5/3/135387403/3679bb771f5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5ff3dd5ccd87e.pdfIn PDF document text
    • http://fuzabura.sportsontheweb.net/potunir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_600ab4b36a191.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/fedb3b6a94c4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5fc7d9779339e.pdfIn PDF document text
    • http://sivajodu.22web.org/what_is_the_number_1_selling_book_of_all_time.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/wisowikezafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_602b58d896492.pdfIn PDF document text
    • http://santand-es.com/dopojagovuluruzisafekipudrv9k1.pdfIn PDF document text
    • http://medtechnika1.ru/ddo_monster_manualwdies.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/5356980.pdfIn PDF document text
    • https://sululonaluwu.weebly.com/uploads/1/3/4/5/134596757/sikem.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/56763142147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/xivatanaf.pdfIn PDF document text
    • http://velirixegu.rf.gd/697862067.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/73723725693.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/gomisexojanedewizuzinosi.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/29212273220.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/importance_of_budgetary_control.pdfIn PDF document text
    • http://kapilijugewi.rf.gd/xepareziwimixikigivobub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 121412 bytes
SHA-256: a45fd4cf19f86578a5839f34b0c4cf6bb40867648c81639bf26c99d56da5f6c0
font_01_sfnt_off000253f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253F3 5512 bytes
SHA-256: a2a708d3fbed48675833ed78a034b44a251c14cca2bfb8b5384fa2468209b9e3
font_02_sfnt_off00026698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26698 10740 bytes
SHA-256: 9fc1a32ced0d264d85759be0d3e42d56f361679f82440f83cfd6522e0f296b15
font_03_sfnt_off00028b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B99 16232 bytes
SHA-256: 5550aee2d324c1284251b1b8f4ea932e27d1e8a15bb02d0b879354bc667cc3b8

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