Malicious PDF — malware analysis report

Static analysis result for SHA-256 e131020203c16f38…

MALICIOUS

PDF

73.3 KB Created: 2021-01-26 08:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 74e02c89c1162c895b4b9ccdcc20b3ee SHA-1: 1c3d8348738c1b39b6791f802f88c9d02b654f5f SHA-256: e131020203c16f388827302dde8ab1ad29284ac512590060ed0c0f5547414503
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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/123?utm_term=peterbilt+389+owners+manual PDF link annotation
    • http://finansi-7.online/mk9_skin_minecrafty2kdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fdbe402385a5.pdfIn PDF document text
    • http://steelsho1.club/free_robux_fit_hole_mod_apk_unlimited_rublinsh0o5e.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hiXgfij/tasty_planet_forever_free_download_mac.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/bdf5cfb3bef1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fe5a9ddc7853.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/ijJJOge/fold_up_treadmill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ff4d11c359aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_600a005b0c92b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff45f48f171b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5ffc677206952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5fd90a5198293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5ff651ba4d6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_600f635de02a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_5fd30ddde8425.pdfIn PDF document text
    • http://hookup750.website/3158652216754fj7.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/xQhgJOc/mutibeko.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/2079986.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/1efa1f48a287b00.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 5460 bytes
SHA-256: a7682f467bebaa26049de7218ebdc41d83ddabe358cf1d9130d4bd3967fe753b
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 10756 bytes
SHA-256: 32fb5d1ac77a70fbaf65ac568310de8c4b1596dd25fe85169150e7d0b31b45fd
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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