Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0bf9a5c70f7107…

MALICIOUS

PDF

74.7 KB Created: 2021-02-13 23:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9893cfb913d4dc4129fcf1b191c6485b SHA-1: 234a914a6d5e1059ee06338fa3503efbc6c20a49 SHA-256: 6f0bf9a5c70f710785d150a73d0f11b3e18691576dda13b3ad245bffbcf5368b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://jottigo.ru/wix?keyword=black+and+decker+blender+bl3000s+manual PDF link annotation
    • https://cdn.sqhk.co/vagizabibo/jfhh0Hw/ticket_to_ride_board_game_versions.pdfIn PDF document text
    • https://cdn.sqhk.co/vivijuzajus/iaignL8/goat_simulator_free_download_pc.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/9252418.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/Gdhbifg/71718884399.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/1BxOYpI/archery_king_cheats_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/tgfcjfi/56144870466.pdfIn PDF document text
    • http://wojifos.22web.org/42180743505.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/earth_s_tilt_and_seasons_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/Osivgis/zevogoxusabuxokoludegumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozazidugo.epizy.com/yannick_afroman_sou_bakongo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/game_concept_design_document_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/jonofawosesumolam.pdfIn PDF document text
    • http://sonazorapabame.epizy.com/roretawibasa.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/menenutuko.pdfIn PDF document text
    • http://jejivosijej.rf.gd/sopide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/1677780522.pdfIn PDF document text
    • http://tewalilakoj.rf.gd/request_personal_day_off_work_template.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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 5644 bytes
SHA-256: 94a40a4e5bab1da202dd1d41b243ef2ac13e1323a322539c0b9fb8f8dfdaa49f
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 14896 bytes
SHA-256: 8ef21e2c7f26753540f141c2ae85eecc7c97ad58bcb9c20bfbc6706c49982429

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