Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e72efdb351a4e1b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc71f63119dc89b2bff5f9ca67844f2e SHA-1: a2afdd6b636f18056283666b3eb51b3f59c842dc SHA-256: 5e72efdb351a4e1bde98cac2fb539a731cb2e7806dc532ef6a303c3bdc0234ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wohntraumgmbh.at/sebutewekijuzip.pdf In PDF document text
    • http://deforma.it/userfiles/files/93072629539.pdfIn PDF document text
    • https://italvaping.com/file/13930152919.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vofoloz.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/23967567611.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/wujuxoferazelesaxe.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/70700221595.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/79973340919.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/97297933931.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/37973233752.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210912140611.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/fekusanefoguburaramowa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377047ce35a---3613280426.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/80551555261.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/datujoxajuxonom.pdfIn PDF document text
    • http://myphamasia.net/upload/files/23696895830.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/352726758612f5c09be66d.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/rogoxapisemu.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/13286261735.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/lomijopufed.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4d6bda44---nizezuvawi.pdfIn PDF document text
    • http://alkanboya.com/files/file///48632331042.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/regafefazosoxapafoburawa.pdfIn PDF document text
    • https://ptogel2.com/contents/files/dafonig.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nizewodidufunituweraf.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/rajelido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=50+shades+freed+watch+full+moviePDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 11048 bytes
SHA-256: e9c955dc387fbcae59c38c7e414cc7e97402760a24b4e6b60aee06fd5a41ae95
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17312 bytes
SHA-256: 9d79acb1fc29769c2a007bd10837f5353cddbccfc8200b783236cf2446d1d8a3