Malicious PDF — malware analysis report

Static analysis result for SHA-256 268d888bf9794a40…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 14:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e371df903b2ce2d871f8ada76cd2432 SHA-1: 9a64284bc4d5afbf88b29e29adf97143aed891c6 SHA-256: 268d888bf9794a403037265140be13accd05ac9df397679e274c7646ad288be2
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/7453998.pdf.
  • 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://druttle.ru/wix?keyword=imei+number+changer+apk+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409797/normal_601ad9899c3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_5fd12714f27c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601d68bfa1b67.pdfIn PDF document text
    • http://copyrighthelpptteam.com/88987697153bbsgn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5fc7353703fcc.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/7453998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5ff59fcab3372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6025dcac105ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamuriza/automatic_car_park_barrier_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/xigapela.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/pezefawadizozinibawi.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/puvexodirig.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/povuxuvifukawado.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/dymo_labelwriter_450_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/offline_3d_games_free_for_pc.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 5276 bytes
SHA-256: 282fdf09e7f75770dca1581f599ee05311d6cd8f43eea7b2d86f2e414a506b26
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10212 bytes
SHA-256: 0d713a3e3df2a7b85e4ff8ec4d1c953483f7dd06964addf05bc6e5b3949b2190