Malicious PDF — malware analysis report

Static analysis result for SHA-256 821fd4bbf3679cfc…

MALICIOUS

PDF

67.2 KB Created: 2021-05-28 05:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a35ee1e0361cba7447f5d9a72d2721fd SHA-1: e1bcac3e732ca33c4f104c1fea438dfa9ac0b50b SHA-256: 821fd4bbf3679cfc52a61da26cbd63dc66444f3a2c43e3193c6b1ef71ef577cd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs likely serve to direct users to malicious sites or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=rupinder+gandhi+full+hd+punjabi+movie
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/5021719.pdf
    • https://cdn-cms.f-static.net/uploads/4408990/normal_606cf4bc9109b.pdf
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ffd882eeebe9.pdf
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fec20f06e81f.pdf
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/f2297bea5.pdf
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5fe83c790c315.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6027ceee74c48.pdf
    • https://buneruwig.weebly.com/uploads/1/3/7/5/137512718/nelovak-wufelexito.pdf
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60584d971dbd1.pdf
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/sevat-nawamefida-vigamo.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/9561935.pdf
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/loduziwivofumuk.pdf
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/7871463.pdf
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/7796523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d25ba3f-c88b-4d8c-83d1-33f695555901/how_to_copy_verified_symbol.pdf
    • https://uploads.strikinglycdn.com/files/87876365-4af7-4f95-83c2-f0872924c7c3/nipegelenabukisikuwodezit.pdf
    • https://uploads.strikinglycdn.com/files/8d2283c3-11c2-4f92-bfa2-2efacd7cf814/what_is_the_electron_configuration_for_sulfur_ion.pdf
    • https://uploads.strikinglycdn.com/files/0fdd7843-f2e9-42ab-918b-5adf494a5c00/information_technology_projects_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e1.bin
e7e299ac192dfe67cb5c2c3f22fa0abc5ce926a1451dc8f54bdce2d6b939f2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5560 bytes
font_01_sfnt_off0000dcb3.bin
47c6cce93bf0543d7e1208b666dc01e492cb2267e8c3678bcf7cfb8716ac377c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10172 bytes

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