Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb6b353094b34bd…

MALICIOUS

PDF

74.5 KB Created: 2021-02-19 20:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac6c893348ea90555cddacfded170d04 SHA-1: 35edccdb6dcd74fa18e3d7181fd5e0402a746d02 SHA-256: 4bb6b353094b34bd73f04612abdcfb5a1049db026beb7b48cb1b52707f3e6646
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=personal+development+plan PDF link annotation
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/2347523.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/jigE6il/64895195868.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/hhxUDdu/84595115603.pdfIn PDF document text
    • https://pivokobofu.weebly.com/uploads/1/3/4/6/134648089/pudafalef-balowis.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/3987606.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/xevuve-malotanef-vuponelolum.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/j9wOjbi/ripajane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevutedijubixit.epizy.com/95711368103.pdfIn PDF document text
    • http://tivagikirela.epizy.com/35225711037.pdfIn PDF document text
    • http://tuxijug.rf.gd/english_to_cebuano_dictionary_free.pdfIn PDF document text
    • http://kekogixo.epizy.com/37771999583.pdfIn PDF document text
    • http://lepajavawis.epizy.com/resumen_capitulo_16_la_ciudad_de_las_bestias.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/68773740636.pdfIn PDF document text
    • http://xusoromi.epizy.com/battletech_guide_salvage.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/fixikosepona.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/42518941290.pdfIn PDF document text
    • http://jefepar.rf.gd/clash_royale_update_october_2019.pdfIn PDF document text
    • http://likijanima.epizy.com/dujanoxajarukazebiro.pdfIn PDF document text
    • http://pokorekajuj.epizy.com/anpadh_1962_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/bodeforelawovixamu.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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 5168 bytes
SHA-256: b8ff5852d9eaff58499a8b4b459234bce96b955cab298fc6efed8e97a6a63b98
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10272 bytes
SHA-256: 801fc5cf3ba6a3abdcdbee09d2dd844489fd65b0212ee0dd74090cf9baddd411

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