Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f609d4339479c8a…

MALICIOUS

PDF

88.1 KB Created: 2021-05-09 05:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e30a989332bca639e752c9f2d7068e0 SHA-1: e5689508f06e392dccfb282e4f87566bb055e361 SHA-256: 4f609d4339479c8a18d954f27c0f60d2b86688546feaad7fd009f6c5b8cc8ec2
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 0.9993

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://midufefew.ru/strik?utm_term=how+much+does+it+cost+to+see+a+child+psychologist PDF link annotation
    • http://reggis.info/86117271271sacq4.pdfIn PDF document text
    • http://plafond.xyz/62672785970lxday.pdfIn PDF document text
    • https://cdn.sqhk.co/rufonova/bJebMii/a5_portrait_tent_card_template.pdfIn PDF document text
    • http://gravkamen.ru/logukezuvijanenibepowewex68tko.pdfIn PDF document text
    • http://subfamjtii.site/mulokakucohgb.pdfIn PDF document text
    • http://policyhelpcenter.com/i_thought_love_was_only_true_in_fairy_tales63ftn.pdfIn PDF document text
    • http://hookup158.fun/41751078763cybqg.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/ioSdifT/gidumijarafaligobub.pdfIn PDF document text
    • http://boost-shop.xyz/how_to_restore_a_samsung_laptop_to_factory_settingsm2dz0.pdfIn PDF document text
    • http://openplafond.xyz/burger_king_potato_bun_nutrition2le0z.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/aMrjage/xuwenuvuvise.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/calendario_accademico_unipd.pdfIn PDF document text
    • http://idealslimitaly-official.site/varifiv7qzf0.pdfIn PDF document text
    • http://reawolt.online/html5_rich_text_editor_examplep443q.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/45645039977.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/dZwgghd/dabex.pdfIn PDF document text
    • http://chempion.coffee/51346505339qq8gp.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/62135683386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_2a808540406c4aedbaac99ed9a783367.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_45083a2fe80c4030b27897d1389798fd.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_d114ac96da404ff88772fc248c39de3b.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/how_to_structure_a_story_ks3.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_3fe0827f1add43eeb540236bb98f11fd.pdf?index=trueIn 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_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 5544 bytes
SHA-256: 2785f22baa4636522d8e294db5f6bb164e5966fa44a4b8761772e3306cddd301
font_01_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 10876 bytes
SHA-256: 5fafa34d06cdf746b14c4744f3e83ad2da9829674a6874a978b2010b117215a0

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