Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd5ffffeb6de7f6…

MALICIOUS

PDF

90.1 KB Created: 2021-02-09 04:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70f7caa8a88378798b992491f1cf89eb SHA-1: ffbaa4eb5f94d1a9451bab1eb8ac3ecf02b839c8 SHA-256: dbd5ffffeb6de7f6a72f18498b6af161fcc066590ef970f16bf005e04b516259
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as malicious, specifically for brand-impersonation credential phishing. The embedded URLs, such as https://jottigo.ru/aws?utm_term=bull+sf++2018, are hosted on disposable domains and are likely used to redirect users to a phishing page. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attack.

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 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://jottigo.ru/aws?utm_term=bull+sf++2018.
  • 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/aws?utm_term=bull+sf++2018 PDF link annotation
    • https://cdn.sqhk.co/giwumazusew/iejjgjc/pepeta_nora_fatehi_song_download_mp3_pagalworld.pdfIn PDF document text
    • http://ig-mediateam.net/67116978571yur7x.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/ejby9p8/46330223583.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/gNgfjKy/download_game_desert_battleground_mod_apk.pdfIn PDF document text
    • http://fc-aromat.ru/archetypal_literary_criticismkt4m6.pdfIn PDF document text
    • http://azorocheat6.xyz/radekubesebujamowupetewop0rkcs.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/chcia6n/jolt_definition_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/rojawamusula/aghpjXb/77553887732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5feb1e76c8f21.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/d1hjKjh/call_of_duty_warzone_mods_ps4.pdfIn PDF document text
    • http://mon-cmbretagne.best/563442083748wq4g.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ijciaOQ/ririkelefo.pdfIn PDF document text
    • http://kernig.pro/fawokanebusedepowepeqve9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_601cdc2c25a87.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/legesiliv/27521639084.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/wwe_bleacher_report_grades_nxt.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/filemaker_pro_14_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/werewolf_game_app.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_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 5024 bytes
SHA-256: 3c619dee5f952880d02dd2744003ff094eb914a93949ad0507543afbdd3bfa3a
font_01_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 12460 bytes
SHA-256: e4d543d24288bd81fc50333ccd83804735b36fc68ca264a5f8230f7e39beb1f0

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