Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aac0cf02a46756…

MALICIOUS

PDF

121.3 KB Created: 2021-02-09 13:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1024aa54261ee27d752e99d7b2bc38d6 SHA-1: 25f730f86fcb6606589e3f06852b06ca2da3bc90 SHA-256: b4aac0cf02a4675649a39ef6fc14f3c3590428816a13ce526439f2b8e03c10de
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a credential phishing attempt, specifically impersonating Facebook to lure users into applying for an Australian visa. The embedded URL, https://maypoin.ru/aws?utm_term=australian+visa+philippines+application+form, is hosted on a domain that does not match the impersonated brand. ClamAV also detected this file as a phishing trojan.

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
  • Brand-impersonation credential phishing lure high 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: call-to-action link host does not match the impersonated brand: https://maypoin.ru/aws?utm_term=australian+visa+philippines+application+form.
  • 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://maypoin.ru/aws?utm_term=australian+visa+philippines+application+form PDF link annotation
    • https://cdn.sqhk.co/lerutefo/fibUjhZ/dragon_logo_wallpaper_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/1gig2Me/best_makeup_for_online_meetings.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hi44sNh/usa_network_logopedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_6014c22c94860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_6018e5b17a4c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_600375f332c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd6ff01c7dfb.pdfIn PDF document text
    • http://ritixabig.iblogger.org/siwutotabilixikefit.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ibieib6/cute_kawaii_computer_wallpaper.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/wizedumi/lulojobetok.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/40706132057.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_off00018fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC0 5184 bytes
SHA-256: ca355f28e2d8b9312c378bdb044adb955124bf7bfa3f6b5c7fe831c7b1be77c1
font_01_sfnt_off0001a138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A138 12088 bytes
SHA-256: 72cbf4f4056ea397a420a3ebbeda1a26b1db95ca8390ab21f63676da28ad1576
font_02_sfnt_off0001c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9C5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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