Malicious PDF — malware analysis report

Static analysis result for SHA-256 24620ab9357eb7d7…

MALICIOUS

PDF

79.1 KB Created: 2021-04-09 11:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 61b8405b2fcb02e69eaef5c7490d6e06 SHA-1: 7de78688a02746134767dbcfc57a1a65aeb89144 SHA-256: 24620ab9357eb7d7c027295827302daef743cb24cdd907dc70f2440b4ca91b75
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 are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=kumon+math+worksheets+pdf PDF link annotation
    • http://899themes-demo.ru/623950392480vx8u.pdfIn PDF document text
    • http://kelnoteres.xyz/gevarukoredtui0i.pdfIn PDF document text
    • http://domavera.ru/24177189781thfnh.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/geifjhZ/34892756704.pdfIn PDF document text
    • https://cdn.sqhk.co/lexujowina/eIjjYgh/mibobesak.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/fjdirjb/67495413346.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/gihhZgj/kinegexez.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/atjiRhd/funny_valentines_gift_ideas_for_him.pdfIn PDF document text
    • http://metazoaapc.fun/calculus_bc_frq_2014_answers7e5w3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijugavagi.epizy.com/85971087859.pdfIn PDF document text
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_b70609d246cd44c199592c6c3813af08.pdf?index=trueIn PDF document text
    • http://konewumabujak.rf.gd/math_101_kfupm.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_7a6128ca84e24d6c89ed9e6d38a7961c.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/82821124238.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/lion_king_timon_and_pumbaa_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/dragon_s_dogma_map_guide.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_a471b402cc3c4df391344a1ece014d69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/eventually_synonym_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/pijof.pdfIn PDF document text
    • http://pixewinodak.epizy.com/auditor_fiscal.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/sasofumowotekikuvanomeva.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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5376 bytes
SHA-256: 586b69a22a9d460ecdaed4acca89f7e845772ee031eb52a759cb52c26188b4ec
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 11236 bytes
SHA-256: 6e98b44b0ccd48f860daa89be8f8ba90211be7e878ee9accfc797d5d5bdf86e7

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