Malicious PDF — malware analysis report

Static analysis result for SHA-256 d669901fd23ec1e4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 01:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9d1a172370777de7a0897493204efa4 SHA-1: 4d0ca9a7aea308934d8c3a5d954a18e51051d006 SHA-256: d669901fd23ec1e4325440ea2dc624de52b200623115e418f347f24e458364d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute content across many domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ilturismoinitalia.it/userfiles/files/91874920397.pdf In PDF document text
    • https://kultmotor.hu/images/files/sesowazarepejufeguv.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/54236417261.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/damabubunimasu.pdfIn PDF document text
    • https://theipbuzz.com/images/file/45303823779.pdfIn PDF document text
    • https://beautydent.hu/editor_up/gaziwivom.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nefufezovu.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/95514506148.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/juvesozawixo.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/74418827021.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wusuloxajoboguloma.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/gutov.pdfIn PDF document text
    • http://sushibelovo.ru/files/wixaxoteripuwubunoz.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/robatilelevoperulod.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/238569934.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/87041071489.pdfIn PDF document text
    • https://italvaping.com/file/13510777026.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/wokusewor.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/lonafafizapetobani.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907105532.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/51209575576.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/59349499000.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/jipukexufagitenarogis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=aot+game+iosPDF 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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 10180 bytes
SHA-256: 061ab98e00faef7510392c3fbcc2b5aba36b9339f1498094eae2da409bc36463
font_01_sfnt_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 16644 bytes
SHA-256: 378d6e27541d4ba96bc2dfc0805da1465ab6fc20d72502133de24655f89eed0a
font_02_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1