Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7e9755a532de49…

MALICIOUS

PDF

77.9 KB Created: 2021-02-10 17:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3fd36b5db819ca89ad36836f0598a930 SHA-1: 8c60ce93f8d5a3d3cac30d80748ad2af552e644d SHA-256: 4b7e9755a532de4963bdcfa64589b424e8f2a3f1fe7367cd8aa721a80d5ce280
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used to obscure malicious destinations. The 'SE_INVOICE_LURE' heuristic and the presence of URLs like 'influencer_contract_template_word' suggest a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/123?utm_term=influencer+contract+template+word PDF link annotation
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/3812894.pdfIn PDF document text
    • http://gravkamen.ru/steam_game_free_download_for_pcrtwrc.pdfIn PDF document text
    • http://maewallace.com/zelelozitabuzipojiregiffmcu.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/nowus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fe644762f644.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/ijbhjeo/75359110537.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/7199753.pdfIn PDF document text
    • http://soul-felt.com/azla_mutlu_olmak9zvfe.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/tabomuwurubopol_maluworogirutul.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/hFjc2ja/lake_viridian_arlington_tx_fishing.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/femasixodokugom.pdfIn PDF document text
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/ropugeko.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/cKUsgiL/hashtags_on_instagram_for_artists.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fccfbce6505b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5ffb9c2d38d8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/43862340126.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/rubujexexejafotuguterora.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/sobukulozevovavujirid.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/southern_university_band_performance.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_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 5152 bytes
SHA-256: 632556c6448dc8e7d8957ca7af60cacb4e4689aff1de82e9de890371e4a8eb57
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10520 bytes
SHA-256: d130d5378eb75f796ac36532b9d8aad5d0c19562071ca9a05e1b4f96b0a91bc9

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