Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf321da4fa89583…

MALICIOUS

PDF

117.5 KB Created: 2021-02-26 15:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7238508ba6f3d0f6c93f56173ed7758a SHA-1: 5e62844979d696cab03b6f6f4c9bfb3c4ad1df0f SHA-256: ddf321da4fa89583867e02138984c6e6a71b37e49f65ae88479b2e0e417b8faa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identify this as a phishing or malicious PDF. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/award?keyword=what+is+3+beeps+in+morse+code PDF link annotation
    • https://cdn.sqhk.co/bojiluxenome/hdjbvo7/futurama_worlds_of_tomorrow_hack_download.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/tirirafusejavesubokowutep.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/icipVjf/us_police_car_racing_2019_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/eZLtzhc/world_of_dragons_simulator_apk_mod.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/71df6c.pdfIn PDF document text
    • http://karoxekixixaz.22web.org/free_violin_sheet_music_christmas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fe229c0354af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fdbe86c1f2a8.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/how_many_milk_ducts.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/gegodibigetirorudi.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/RigUdhj/jutokirubiwuxun.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/dell_inspiron_3847_mt.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/jev9ngg/deep_sea_rise_of_the_jellyfish_red.pdfIn PDF document text
    • http://bagadiwep.22web.org/77417830096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fe58da4457c0.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/zemigiduwagafu/74577151794.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/xuranurosiwovopiv.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/89880869019.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/19603105646.pdfIn PDF document text
    • http://gezibetaw.epizy.com/cbse_class_10_revaluation_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/have_to_exercises_worksheets.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_off00018cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD2 5600 bytes
SHA-256: 11c29bb98c867457c3613afb72a62bfde167b999f6cf674f57827deb2804b9d2
font_01_sfnt_off00019fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB2 12980 bytes
SHA-256: d1becc161b1d2a0a9f5753c56d9c233b7bb19cc316e136c302270c4deedacca8

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