Malicious PDF — malware analysis report

Static analysis result for SHA-256 4093418066afaaab…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 07:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fbf5582c54c0a178543c67a1a38e93d SHA-1: e46e31ad698095fe774c350581f327909d3da8f5 SHA-256: 4093418066afaaab2be8b1e9cdb433891086ff69e285603ccb10e53f1677101e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured with UTM parameters, suggesting a tracking or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct, disposable domains for hosting links, a common tactic in phishing and malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=deep+learning+a+visual+approach+pdf PDF link annotation
    • http://homespakistan.net/magzine/uploadfiles/file/57044235579.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/21793880543.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/12123238988.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • https://il-gusto.com/images/file/kuvanawuwexekowamanitoja.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/rutemisewikufusudibagup.pdfIn PDF document text
    • http://snft.ro/media/file/libadipavejalewud.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/18604301180.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/rufif.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/7825873263.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/11071380507.pdfIn PDF document text
    • http://zl369.net/userfiles/file/10352288970.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/57193560650.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/60013119210.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/kurozaravu.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903110730.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/lusituzaxigepiw.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/91491878254.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389dc048c7d---35333088854.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/xigipopo.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/nirakabefewelokekituz.pdfIn PDF document text
    • https://ms01bet.net/contents/files/ginodixe.pdfIn PDF document text
    • http://creationart.hu/files/file/73995847971.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://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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 10968 bytes
SHA-256: 72621cd4f18dc611ad2beb06ba93a9e1ed5091577306e2bd900944ccf5a2e06d
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 18976 bytes
SHA-256: 986030b33c91ea19b3612dd2d92fc43d60dc785e7edda26b829ce1c7202b2176
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.