Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc534a2f553d0c6…

MALICIOUS

PDF

78.0 KB Created: 2021-04-08 00:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a1ef0725486ead9783fecf67eefadf76 SHA-1: 7d3a3cc7029c44594008bab89faf6938a4080001 SHA-256: 8cc534a2f553d0c6604bc0dfc76d1860c79f7d70b0617808f63016475ca47712
166 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 a password-protected-archive lure. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/strik?utm_term=how+to+reset+wd+my+cloud+ex2+ultra+admin+password PDF link annotation
    • http://bidimiw.sportsontheweb.net/46032197253.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/barron_s_math_workbook_for_the_new_sat.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/iigiiEC/bewapakosevod.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/abstracto_ser_bachiller.pdfIn PDF document text
    • http://nusezuretoti.scienceontheweb.net/soveriribizatanafi.pdfIn PDF document text
    • http://olipaka.xyz/ilpa_guidelines_3._0cfnqr.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/37145018673.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/85586775874.pdfIn PDF document text
    • http://jnatural.space/236272249965ic4j.pdfIn PDF document text
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/jasalasivegotuf.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/tcjfxih/imci_latest_guidelines.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/xozekud.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/pelujuxonuta.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/basiruteluvufe_xodasijazom_bovelo.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/44824949837.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/zosevid/7514942816.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/panchatantra_stories_in_marathi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/82345936243.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/fender_hot_rod_deluxe_harmonica_review.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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5576 bytes
SHA-256: 80e40f92b58f6c94043117fbea2ad150c621488d9a0545a3f65aa57c64e3b526
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 10956 bytes
SHA-256: 5a74ac050eaf817c15b708fe5fa7861e4426798184050a34600bc8ec1e80a381

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