Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d7915cfead12c3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 12:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81fa181b920623bbe4c7eab3534ca145 SHA-1: 2abc93b7e9616a1a229b09f83255de64c7180dde SHA-256: 80d7915cfead12c33f11cb41d94c5bfaf6eb709cfa686c291c39c5650407b246
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, likely leading to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=fast+and+furious+8+full+movie+free+stream PDF link annotation
    • https://csam-villepinte.org/uploads/images/file/74572140321.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/79118204534.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902035834_1843729130.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/35334954031.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/90058024522.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/gesitepofenewexabi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jipevoteniwamagekituvava.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.pdfIn PDF document text
    • http://ilkemymm.com/image/files/24695547692.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ce330a09fd13cd97a81503bd16009c43/topumifaxas.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31178680438.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/buvudomajovuj.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/denumozakinajedotu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d16e6e191---22318994979.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/rizazotatojokalopepobo.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60270572920.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/46445533916.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/36012882921.pdfIn PDF document text
    • http://dsfly.com/uploads/files/wewadapotusixonazinaseke.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/vusutedomigegesusuputedaw.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/6765305718.pdfIn PDF document text
    • https://petribax.com/userfiles/file/18780796614.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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10868 bytes
SHA-256: 13c3a844dc50e4059894a4f1f29f7cc2da23ea0d752618c1ced5c2a7e7aadeb0
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 18048 bytes
SHA-256: a9a67e972fd9e32d6f21e4624510a876af3de36af75e397100aaa41605d4c314

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