Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19370bdc665d42f…

MALICIOUS

PDF

78.5 KB Created: 2021-05-19 14:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b98ae65752564b8ed0cc87eb1dce0712 SHA-1: 7342512420b28464432408573a093e69588ea200 SHA-256: c19370bdc665d42f94f93b977aa1bca5c489029ae812851319232f388660d6d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classification and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, containing numerous external URLs that likely lead to further malicious content or phishing sites. The presence of many external links, some on disposable hosting, suggests an attempt to manipulate search engine results or distribute malware indirectly.

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://leonvi.ru/strik?utm_term=toot+toot+parking+garage+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffd47bdef372.pdfIn PDF document text
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/7205503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5fcb1ed9761db.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/vofaged-wejofizu-xixiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fd9fe065eff7.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/nomuwumidumodef.pdfIn PDF document text
    • https://faniwavuguvupos.weebly.com/uploads/1/3/4/4/134478403/2565075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_602a8a1a6493c.pdfIn PDF document text
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/8767965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_603b6d425d118.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/7183360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_6046ec5662a1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bufipevuril/email_writing_formal_and_informal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52917d2e-0b2e-424a-83a6-2b6474e15531/zitomosazafuxatimesifan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c87f5c1-5ac2-4d0d-b066-7225a33bcc58/kasofugekosaxaganilun.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/50678774534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71524cf9-e63d-469e-9f28-2c49c3b23505/bovivowex.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/katinig_m_worksheet.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_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 4964 bytes
SHA-256: ab09a74ad7548d31b8d9ffb1778c73f56f630598314fd0ecf6e952a17424ed52
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10672 bytes
SHA-256: c44d3d8ac96b60935546b3b67d16f3dccde0f052b2bb81a45d9fbc3c0a43e2a3
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30
font_03_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34