Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb7cf24099cf052…

MALICIOUS

PDF

78.6 KB Created: 2021-02-08 21:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 019879cef3317097de8b437b67f347b3 SHA-1: c64616911206c7ea9951d4ab8bc024d2aecfe72c SHA-256: 9bb7cf24099cf05216eedc3b20739f836ce7d474875229ba9984e4fad49acfaa
186 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a credential phishing lure impersonating a brand, utilizing a redirector to a malicious PDF. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or trick users into downloading further malicious content, likely through a compromised link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/xojibo.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=atal%20pension%20yojana%20details%20in%20marathi%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467975/normal_5ff87f6a4df09.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/xojibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502268/normal_600657aa339d6.pdfIn PDF document text
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/xogin-rojuz-kesaxiduwu-totes.pdfIn PDF document text
    • http://artyom.guru/libro_historia_de_espaC3B1a_2_bachillerato_santillana_descargaryfcfc.pdfIn PDF document text
    • http://zajowidased.iblogger.org/free_willy_harmonica_sheet_music.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/tuzevibofi-logebig-bejumakupo-gitavivod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_601f10736aa0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488592/normal_5ff3008a7b73f.pdfIn PDF document text
    • http://apkweb.net/lusikunavvzr4k.pdfIn PDF document text
    • http://grinallex.shop/9811115208lcf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poweradufuxi.epizy.com/suzubupuwuwufok.pdfIn PDF document text
    • http://xawazixe.epizy.com/humptulips_river_guides.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/rojaxewexiva.pdfIn PDF document text
    • http://kegipufi.rf.gd/earth_song_frank_ticheli_piano_sheet_music.pdfIn PDF document text
    • http://zatugawaxevi.rf.gd/isrotel_beresheet_spa_hotel.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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 5448 bytes
SHA-256: b60b209c92f44d5473aa049d72dde3a9ed53e5f95c3d764cd80c726202a693da
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 10580 bytes
SHA-256: 6763553856c539d30aa323a059d0620007e7919e4357bafe224844ba0bfe76fc

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