Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fdd609405d9d1b…

MALICIOUS

PDF

84.3 KB Created: 2021-03-31 01:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3ddbfaf5d0a310066f830e482ae8b45f SHA-1: b35cd3344c2acbc151d37a7e91bb6d71b6f47054 SHA-256: f8fdd609405d9d1bc6b4d285a31034c71d895b6f652c3555fc23098d1a41f737
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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://nipisod.ru/wix?keyword=a+seat+at+the+table+free+zip+download PDF link annotation
    • http://jalazekesofijot.medianewsonline.com/66810193474.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/aU3aon1/kleptocats_2_codes_2020.pdfIn PDF document text
    • http://bokubewere.22web.org/2443604166.pdfIn PDF document text
    • http://xiwikene.iblogger.org/biborotufekuwejapu.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/gj6cqdi/tanuzuleganugilikoz.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/cancer_de_cuello_uterino_scielo.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/gjjtfjg/32726328515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://giguxorepego.epizy.com/teh_bunga_telang.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_1fcda1e75dc5417fa35344a5039b6b44.pdf?index=trueIn PDF document text
    • http://pelidotuxige.epizy.com/42418894805.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_6cec5d1c00f24c45927ddba24c17442d.pdf?index=trueIn PDF document text
    • http://fekedavo.rf.gd/vofijinigujomeniwezonijad.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_a2aed6862be343bcb5743a494c33a611.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_53a03d46df464870ad30f3ac188265ab.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_2771f9904e0b4aedb104e289d14da1fe.pdf?index=trueIn PDF document text
    • http://sisadeb.rf.gd/navy_seals_or_marsoc_marines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8386d460-cc1e-4c8c-b204-6b16ba77c1f5/30101988665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2f09b9-9e43-4583-b76f-b006a81f6d96/89385999174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2f6663-ee0d-490c-9dda-f86ea0e8f9c4/54135797166.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5188 bytes
SHA-256: 728c585f39ba8bb0b715bcc1ae33d1575b07271a527dc39503d885050e555c31
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 11268 bytes
SHA-256: 9b3a79624dbf910a8dc8d238f322938e8b5a3820a4d53f243616fcf0f39a8817
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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