Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b45b604cca68ae…

MALICIOUS

PDF

69.1 KB Created: 2021-09-09 23:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1078e19f27afca24a9ece061249edde5 SHA-1: 9d109807a63f89ced02d38ebf929d92ddd284e37 SHA-256: c2b45b604cca68ae7570c1b022d257f8f10f4e007e5926dae6c921afe935c686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive web presence. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cructi.ru/uplcv?utm_term=tapet+mod+apk PDF link annotation
    • http://jeanthompson.nl/ckfinder/userfiles/files/pizajibumavuxo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/vimatagomamebiruvo.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905123805.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/70389532663.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309225e7d15---18003920957.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5dd68dfd99c6a9186edf13ea8bc41889/52669091431.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/3612633060.pdfIn PDF document text
    • http://telektrans.hu/editor_up/ruzidivojiwokakol.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/53255026763.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/golaji.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/rurapigububomuxawegozo.pdfIn PDF document text
    • http://askort.pl/Upload/file/sofefuxevixologizepo.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/60760934131.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/15203226534.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/28204494270.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/82490772095.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rixijigeluzezago.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/torepisatiratikeki.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/sanulelef.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jumewinadiwukuvezovukuweb.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/tuwamuxaxopa.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/zuvuwagunuruvofaxenix.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109041659008907751hvw69.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/16950972030.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/duvalumizinetebib.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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 14988 bytes
SHA-256: 7855fd51557117139678a7101a665d53b400b7ac20238c81b012e3458283ceba
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 10096 bytes
SHA-256: a653b161008a9d3013dcd61b953222a8db2649e333898c709d85873e38748a58
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1