Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e4a6eacd515b79…

MALICIOUS

PDF

84.4 KB Created: 2021-03-25 03:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 87a19a61efab1a5253c439dd9447ab76 SHA-1: 5381ca3775f6974f3a7b2cf2b70282baf5eaff02 SHA-256: f7e4a6eacd515b799332d8fbafd4acb793ca453f81138d737e458c7620c3908c
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 0.9998

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://kuzutuzo.ru/123?utm_term=free+consumer+reports+canada+vacuum+cleaners PDF link annotation
    • https://cdn.sqhk.co/madagijoj/0LhjbI7/23925104251.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/sQgjhhD/39860568404.pdfIn PDF document text
    • http://afracheat3.xyz/nesewasopuvisajoks2ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/iamgfge/best_ping_pong_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/XAvtig3/translate_web_page_in_english_chrome.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hjjhjys/among_us_imposter_dancing_hop_ball_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/ELNgigj/32694315743.pdfIn PDF document text
    • http://axecheat1.xyz/zunowi7aie7.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/ngdTjj3/siwinapareduwimaz.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/washington_post_crossword_puzzle_booksbj0o8.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/bgjib6v/6194126746.pdfIn PDF document text
    • http://micrometer25bill.site/regina_olson_hughes_known_for25x7i.pdfIn PDF document text
    • http://universal-kirov.ru/legal_dictionary_online_english_spanish0uugd.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gFMtEbW/tebisuxeselidekosavuz.pdfIn PDF document text
    • http://magazinrf.xyz/wuzafujubi7t2cz.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/dl6Lgen/xodadokajilalidaxulux.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/N5pge9Y/mekadebinulatewiregozop.pdfIn PDF document text
    • http://kasyanbeauty.com/em_pentatonic_blues_scale_guitar_tabawglv.pdfIn PDF document text
    • http://kkkirrreeee.space/dologapebirodr4rc4.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/CKgcmPJ/red_ball_gown_dresses_ebay.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_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 5232 bytes
SHA-256: 1c0554289be91207ead39f2650dba0750cb7d4fef847229c4de171f84a2e9fb1
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11208 bytes
SHA-256: 3cea8e2bea123232090b6f0b12265bc647ba515f072744ffa3dc61e646baa0fb

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