Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a34a617bb3b872…

MALICIOUS

PDF

69.4 KB Created: 2020-11-21 07:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 223a4f5bf9f61aa5e0b7c7c4592179af SHA-1: 078c92b897e6e75011bcf8ef7e6901b46bc59177 SHA-256: 93a34a617bb3b87253444bbf52b541acf874e0224748870318ca756d1b2cf344
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. While no scripts were extracted, the presence of numerous external URIs, including one pointing to 'trafftec.ru', suggests a malicious intent, possibly for SEO manipulation or to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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=online+answer+sheet+bse+odisha PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fa4970e25971.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/kirifu_fejotakokopejad_vumivij.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/roware/idesk_desk_chair.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/85805820449.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/geektyper_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/46469825045.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/powiwogo.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/56050496688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c8d429-c821-45ea-8e3f-a67a4c77b986/lewis_structure_of_h2co3.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/diccionario_biblico_ilustrado_holman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4cd31f-02cb-4182-a885-edb984905644/masse_volumique_du_lait.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 4960 bytes
SHA-256: bcbd6edf87c1d862e61245b9259f3e6d3016e456e9350398c19883b62c08e087
font_01_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 11204 bytes
SHA-256: 1071dcdfbaf5696a2fc1c6914ff8b35a833f7b94b838c1255b209a00b5fa56f0
font_02_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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