Malicious PDF — malware analysis report

Static analysis result for SHA-256 698c1632e965a58e…

MALICIOUS

PDF

66.8 KB Created: 2021-02-27 14:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fc423738875f8a66b9712008d264e8e7 SHA-1: 6857bde23744e9c944ac28375f1744d1f086859a SHA-256: 698c1632e965a58e3f4e607ceb08df64b56df553d84d118df464a03b43b14721
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'multiplying decimals video with models', and a 'download button' heuristic indicates a call-to-action. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/award?keyword=multiplying+decimals+video+with+models In PDF document text
    • http://rezonansmusic.com/maduzedevapazivur1oab.pdfIn PDF document text
    • http://usacreditcheck.info/579423426062vam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408996/normal_600397964504e.pdfIn PDF document text
    • http://kamini33.ru/diablosport_intune_i3_platinum_reviewi610w.pdfIn PDF document text
    • http://mebelintera.ru/zewekotuzepusufofigojona5ihs3.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/iiozOgh/3238575622.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/xivarubakeriwodotu.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/Nf3SieU/sadofabig.pdfIn PDF document text
    • http://experiment.website/57821643325p6u8r.pdfIn PDF document text
    • http://detonic-shop.website/the_best_salesman_in_the_worlds2bln.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/KZPijR6/39204563674.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/69383990072bn8th.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416128/normal_5fec99c90b73e.pdfIn PDF document text
    • http://50offstore.info/85277966059wsyyt.pdfIn PDF document text
    • http://tesocoin.online/40886514522ds9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/xoluxuroku/gqwdiii/fizodizi.pdfIn PDF document text
    • https://pixokunotozonux.weebly.com/uploads/1/3/4/0/134017876/jipik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 5652 bytes
SHA-256: 92bc7d4b99862508fdb51937c05bd207e01afffd1869e671c6388280a6821c7d
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 9740 bytes
SHA-256: d5f4353bf8e9f563b4d11fb1f45733a222e6ae0a7c076dabbba6f88928d255ed

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