Malicious PDF — malware analysis report

Static analysis result for SHA-256 d239b831f2859bfa…

MALICIOUS

PDF

87.9 KB Created: 2021-03-16 10:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: adf3bb905713ce2a68c28576cdf2bfb3 SHA-1: 10bd1a0622b77dfc14529f7da32c74f3bca84495 SHA-256: d239b831f2859bfa99cbac3db1680000125a4280e29efbe4e3caf9d2bf2af52d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=the+organometallic+chemistry+of+the+transition+metals+pdf PDF link annotation
    • http://xenalebosob.scienceontheweb.net/beyond_the_sea_ukulele_chords.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/nafubaxevi.pdfIn PDF document text
    • https://mumotajesok.weebly.com/uploads/1/3/0/7/130738730/sinijojumuxum_vejel.pdfIn PDF document text
    • http://duvazejezirofid.22web.org/computer_background_photos.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/pelurisa.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/Sidlxic/furious_car_racing_hacked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/jfhcFid/youtube_pencilmation_pregnant.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/Ujj3kNy/55257038592.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/satupowusuvuvave.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/e2dded4d-c23c-4ff2-8905-b30f5f6f33e4/how_to_power_off_cyberpower_ups.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_63582529a9d6462398851057f16e22f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bda7a9-d45f-481f-8353-72ebdee91d46/25951197251.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_601048e38fc645e38e4c3b1e15642cfb.pdf?index=trueIn PDF document text
    • http://dipimov.epizy.com/98027151241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b480175-539a-4ee2-a6e4-81451b763f62/62092736658.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_788962cf9701447fbc75a2c350aa175b.pdf?index=trueIn 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_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 5620 bytes
SHA-256: b6bda67c1e8f600ad7a77aed634fecd3d8e4540c5d78e2183ca29a65bc6d5634
font_01_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 11420 bytes
SHA-256: 127e760f6532e655087b484bc96f3bebe64730205c125a3bd866a05992751d5d

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