Malicious PDF — malware analysis report

Static analysis result for SHA-256 b432df7d426418f0…

MALICIOUS

PDF

67.8 KB Created: 2021-10-04 09:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 452834a72ebf63e9e16608a793865a86 SHA-1: 3658e91c73fda2e201fb874017624820981e2a30 SHA-256: b432df7d426418f0faa51d9e5c95094be48d9aff5bd85fde245bc699e127ce24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML score indicating malicious intent. ClamAV also detected it as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the use of link farms on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://upservice.expert/admin/ckfinder/userfiles/files/nusorolajuluponape.pdf In PDF document text
    • http://savalis.ru/userfiles/file/susikemesaxu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/520aba1e3363b8f099b8333f0023b918/37971172730.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/97369128333.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/suraverepuvodinese.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/lewazepazuxuguzanaxemo.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/vonazova.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/31503387452.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/mezemeluxalopifuriruwe.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/48635688725.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/4243456176.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/91852476250.pdfIn PDF document text
    • http://keitbg.com/images/files/10265907449.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jogepobikabewosi.pdfIn PDF document text
    • http://vitrine-prof.com/files/59569909172.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/58519454014.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/48422175563.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/suworotabasafo.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/43719830277.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/mutaputuradikogopifem.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/lamunigika.pdfIn PDF document text
    • http://mousike.it/img_ins/files/napibarapomoxupapunev.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/64510299927.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/rasubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=c+section+gluePDF 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_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 10272 bytes
SHA-256: 001c97cb63452fa6b2cfd0e2a02adb74e07cd7f4f0bf917dfd35108cbbc2611a
font_02_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 14800 bytes
SHA-256: 7ea67a72035ac1d4a1038efb8cc72c54deef2d01431138b40d84b40d1627a44f

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