Malicious PDF — malware analysis report

Static analysis result for SHA-256 617b337cc0b201a5…

MALICIOUS

PDF

91.6 KB Created: 2021-03-18 06:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 167d3a8bb4719a4017b75235385b4059 SHA-1: d9d722e23b18ac97871ebaa77d2fa7d280890256 SHA-256: 617b337cc0b201a5361f4ca7c238da55d3a8e0db6497fd24b975148b6bab2a67
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/award?keyword=ciencias+naturales+pdf+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5ffca6c97ad2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5ff85e5756972.pdfIn PDF document text
    • http://kapusta.pro/papafobagotojahc5t5.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/igqhiji/watedazidinubazowigogame.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/jhgigGc/fluvsies_a_fluff_to_luv_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/fhhJqDx/retaxajivax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450723/normal_6007db4de3119.pdfIn PDF document text
    • http://nakanilo.club/turedejazererunapmdq17.pdfIn PDF document text
    • http://copyrightreports.com/discurso_de_xv_aoshbq0w.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/jQjbFPN/mermaids_cher_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/PzHheEu/classwork__class_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601d48160faae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_8c0c023e0b1e474caec643e0b599eedd.pdf?index=trueIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_8b937a2f0fc54fc689333d79c5c36acb.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_6c504295d4614272a71c47a1edd098ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/delta_bennington_sleigh_4-in-1_crib_instructions.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_cdddf0ee067e4b33a5febdd6e2723f3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/75024504362.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_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 5180 bytes
SHA-256: e043284ab4ab6d7a82fe825c15ce1502273e640a28251cde72d324f21c9430dd
font_01_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 11556 bytes
SHA-256: df8356f70ed163f3ebddd5ac5d4b01f7026cc7e007dd050f8cd7f275005fe445

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