Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d7030e0f3a90a8…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 16:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3aa9c8cd98dc1f9858ef1fbb9495849f SHA-1: ece7b8212fa6b08db188640c026fccee6dc879ab SHA-256: c8d7030e0f3a90a8059d49dba0f6ab311b01c81ca9aa784559edd49cb0d27909
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload delivery. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the true destination or distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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 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
  • 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/123?utm_term=bsc+publication+math+book+pdf PDF link annotation
    • http://yachts-4-sale.com/lokemuvigev32m7w.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/indian_english_audio_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_6065631b34f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6042c32ad630a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60201f479ed8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_60596595a343f.pdfIn PDF document text
    • http://goldenframecollision.com/15754471514p1idb.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/rijapezatopik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_605d7662c3487.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/635073470707ki3u.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/xbox_360_controller_not_turn_on.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/mathematical_physics_by_satya_prakash.pdfIn PDF document text
    • http://vseti.life/spiderwick_chronicles_game_for_androidy2kk8.pdfIn PDF document text
    • http://smartycredit.info/nwn_prc_modk79bw.pdfIn PDF document text
    • http://bestrongbyg.com/509141975439f2gi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_606af1603618c.pdfIn PDF document text
    • http://testertumentum.space/mijogekoxikuvabed9rfa6.pdfIn PDF document text
    • http://vilopeg.xyz/masque_of_the_red_death_1989_film251db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/38713929611.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/bepetul.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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 5552 bytes
SHA-256: da4d84ff3e14be1271c5e4256fc3310b687504131900f266beb666619564206c
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 11120 bytes
SHA-256: 74ece818a2b3fe0e1dde427912b1ec95f130bd6132f164b2866daed233e2ee97

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