Malicious PDF — malware analysis report

Static analysis result for SHA-256 e985b9d87ba6a348…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 00:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d20eba59f5e8fe7d3b1779f9918a4cdc SHA-1: 636c73ab895e2616052bf7f9f204d3d98fffd482 SHA-256: e985b9d87ba6a3488023897f4a63b9e426e9fef779a7a3ed3b0ea1b233fe2175
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to potentially malicious or phishing sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the PDF's primary purpose is to redirect users to external content. No scripts were extracted, but the nature of the PDF and its embedded links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://thebeautyofdesign.nl/ckfinder/userfiles/files/53099684034.pdf In PDF document text
    • http://kfbma.org/files/fck/file/21863819202.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/rubepulikovur.pdfIn PDF document text
    • https://norservis.cz/files/files/64438632270.pdfIn PDF document text
    • https://phr4u.com/files/repad.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/durevigubojekun.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/86666140375.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/vonilu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/18881992590.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cac4253e80823538614bcd38aa3a648/xexutugibutuxasanod.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/67384018359.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/41302288005.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/biwevodazuwudufiw.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/31862299178.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/75416370851.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/gosogurejebivililurokifa.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/sotumavefomizef.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/79773641642.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8a54d0d8---89062683603.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vusejumaf.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/nilekirozivuta.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/163172523383.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/vawipilatinunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=open+mobile+api+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_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10452 bytes
SHA-256: ee34fdea3d094143685584c276565f9a8b802f4835ff0c28c928128f4bce4cdf
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 18704 bytes
SHA-256: a57bf0cd6df18c1c4bcc5e0209c42a067994add96533b2a67e6d55656117daa9