Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7921e9046e0f7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 11:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5256c7a76a5d63977620054eec159672 SHA-1: 940d1fabf6d947392825ab65daff1c6a50f8a230 SHA-256: 4eb7921e9046e0f7994d5fa216ccaacd878787273dc7610da2ecf18f3341eb9c
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 0.9996

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://maypoin.ru/strik?utm_term=customer+service+manager+job+resume PDF link annotation
    • http://instgrmmverifiedbadge.com/habits_of_mind_posters_free_printableb9plo.pdfIn PDF document text
    • http://copalofa.site/53342660451qfeux.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/jomudawo.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/ggqJgiQ/final_heroes_best_team_comp.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/817051.pdfIn PDF document text
    • http://oneplusonemain.xyz/calculus_with_analytic_geometry_simmons_ebookgrfnr.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/pdLieAt/1501120624.pdfIn PDF document text
    • http://prizinsta365.online/dyson_slim_ball_multi_floor_vacuum_reviewsucdnj.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/xojufizusomubote.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/vevusuzes-povezetoluno-paboj-likaranirekigim.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/novexasisix_delufitale_duwudaradasot.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/NjgQ8Xp/53571225694.pdfIn PDF document text
    • http://qlemelest.online/beko_excellence_washing_machine_user_manuallzphq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukisiboviwal.epizy.com/how_to_expunge_your_driving_record_in_maryland.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/apache_tomcat_for_eclipse_luna.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/davoxojogipomoxegik.pdfIn PDF document text
    • http://sivebiza.epizy.com/52484786101.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/mugunejiro.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/how_to_program_pentair_superflo.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/annex_contract_template.pdfIn PDF document text
    • http://wuxekijonudi.epizy.com/69633459985.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/sabamekaraw.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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 5268 bytes
SHA-256: 5eeb531414b672632217ae4395b7287514ffdd91c07810f846fdc97633ba6697
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 10264 bytes
SHA-256: c3a7698dcbdd6f407dd10b7b2cb4f0f9d9472030e3bfdbe3f03e3f3c0ff54064

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