Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b2fa39191db153…

MALICIOUS

PDF

78.9 KB Created: 2020-11-18 14:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 74c84ab1782673745647f909a14a030b SHA-1: 73aebefbe525bf5d2c0bd5fb445fbd48c9816b8e SHA-256: 52b2fa39191db153fb046c9519a66321ca91997459d90ab6e08cc9dd11a2f21b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, and one specific URL is associated with a passport application lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=us+passport+application+form+first+time PDF link annotation
    • https://zipexozinapewew.weebly.com/uploads/1/3/4/3/134339437/kenatajemilusupunufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f897c1614946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fade5b5e8db1.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/fe505683-6c26-474f-9f58-d05bcb0de2eb/16097554608.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/36854541818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fbb2b8-92e1-4382-9a5d-d7be2423e8db/35572745343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731e3444-12c1-450c-9b3b-de41df5ec40b/unblocked_games_66_3_point_shootout.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/wudoninij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d47d523-a133-4e3c-9171-96efc52b8d5f/1715356714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf16f6f3-e2e3-4df0-a183-250df295d957/67807012735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdc860-3baf-46e7-b925-0194fa85a226/vofogomabemi.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/zomiwezovijejefoketinipi.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_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 5152 bytes
SHA-256: ffc8cfcce368528923c6b49186f722b228147c106108bb15c407a5c80a7f7fe7
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 11212 bytes
SHA-256: 7255e322b7a4a2cf4da230df36d52198203e80f52fb4b535a2814fbddbde6e95

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