Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251caf32f18cff3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 18:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6ffc957e5e4490ace5210038813d327 SHA-1: 0b9326b5674b23ecfa8da7f9898036acc4970e29 SHA-256: 7251caf32f18cff382b784f8fa57b333e8f8a6657d0d9aa55f776888b0da65ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://apcmagon.com/userfiles/bijibemavufagomimiwixosew.pdf In PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/gubisekaw.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/99557321967.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/fuwosesoxobifedozivol.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19507529083.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/90368618408.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/duwukomepekivekeguderit.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/palejipufumubeniva.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/33963645432.pdfIn PDF document text
    • http://zegaoyun.com/calisma2/files/uploads/sosenoxuguv.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/62462145105.pdfIn PDF document text
    • http://online-cycling.com/files/file/dezid.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/63783553067.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902041916.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0ukbo7qd9oc6788flk9dnh5e7m/39811670359.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jalawerovunuti.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/raxana.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a484632b28e8c3cf30cdac175ce200ba/65512729133.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090601481853.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_6C408A80A9661079.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45829680880.pdfIn PDF document text
    • https://www.confirmedtour.com/files/43300939639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lost+texts+on+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17872 bytes
SHA-256: 99aa0a2af915f50c5e1b428def9c2ccceaec9d5493b6165b6d028324574c9ef7
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 10252 bytes
SHA-256: 42b147ce4a5f4eb8be2d4dea2cbefdad8f0a1b5d3c5589c9effe379321c69194

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