Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a771f5128831d70…

MALICIOUS

PDF

139.5 KB Created: 2021-04-20 18:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f393cdee8dcbd6ca9ade4367a520f76a SHA-1: ec0d824922a093920195284ed430be737c8be961 SHA-256: 9a771f5128831d708153641e6be23992241c28021b885c21802ea1876f591801
246 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including a critical phishing detection and ClamAV. It contains a link farm with numerous external URLs, many pointing to disposable domains, and specifically impersonates Facebook to lure users into credential phishing. The document's structure and embedded links suggest it is designed to redirect users to malicious sites for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/8360823.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://mezovuduw.ru/strik?utm_term=ps+vita+x+date+de+sortie PDF link annotation
    • http://noverst.xyz/sdgs_17_goals78n5o.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/56633142799rt4vr.pdfIn PDF document text
    • http://cleaner360.shop/weber_e310_vs_e315skg7a.pdfIn PDF document text
    • http://how2clever.com/zogenifurakarukbxobt.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/tiny_dancer_elton_john_sheet_music.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/8360823.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/welipumulafozojo.pdfIn PDF document text
    • http://organicsss.space/kepijelarixexiruwajee1njj.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/24397137484.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/758af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4a1feb-f92d-4ca0-8218-548ee84a101a/f_reif_fundamentals_of_statistical_and_thermal_physics_solutions.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/teoryang_moralistiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32582057-d2ec-4d89-8c20-11f02a4c6e85/vofisomikunine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167c5d83-796f-4058-a77b-1c8b9139bc88/wordpress_change_user_rights_in_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c96f612-777b-4c87-b253-0d26ecf02291/19096695506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c90ce97-910c-4c35-9fcb-6d4628505320/sony_ps_lx300usb_turntable_speakers.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_off00019495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19495 23964 bytes
SHA-256: bc2ad20da67f6ca176d9ca2db90db85d26820c2ea05a0530c6100e4e8f274586
font_01_sfnt_off0001e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0D4 4916 bytes
SHA-256: 71dc27c23582d3ad49eeffa1b9c0f295f62a2c46dafacee41adb1d352f16b3b1
font_02_sfnt_off0001f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1A1 14336 bytes
SHA-256: 4b094f5274cfbb4822dd1f33bd50d30aab5af6aafeadf7f732d534a259e49f87