Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcdd2c234733aaa…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00ad3dc38aa6e830082c7b47a7735f0d SHA-1: 584f95843eb2c2f5dadd0c8427003549bc9531c7 SHA-256: 8dcdd2c234733aaa135c955e88b76680d64c2b67869e6fb3614d3e9df7068810
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ML classifiers and ClamAV as a malicious PDF, specifically flagged as a phishing trojan. It contains numerous external URLs, many of which are embedded within the document's structure and appear to be part of a link farm designed to redirect users. The primary purpose seems to be directing users to potentially malicious websites, indicated by the high number of disposable hosting links and the presence of UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://cructi.ru/uplcv?utm_term=coming+to+america+1+full+movie+123movies PDF link annotation
    • https://bengalroys.com/ckfinder/userfiles/files/kapazufadaxal.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/lotanudosejisa.pdfIn PDF document text
    • http://zatacorp.com/upload/files/9529020632.pdfIn PDF document text
    • http://itena.si/uporabnik/file/59443560180.pdfIn PDF document text
    • https://hse.tw/upload/file/xagat.pdfIn PDF document text
    • http://hidramaco.com/files/files/lugomigazukumirilolot.pdfIn PDF document text
    • https://salonrewards.ca/images/file/11298912354.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630972253.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/jovulalok.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/janujorituzev.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091205110470554.pdfIn PDF document text
    • http://denge.aero/upload/files/garip.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/fixufu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jijiji.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zesokazuxajepovad.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/beporinesikutikazodovu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/79881169080.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/30924320414.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210911063314.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pimagunopugubenogonoraf.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kibafawomalo.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/29304598111.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/23983626391.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/73539328235.pdfIn PDF document text
    • http://nincity.de/inline/file/nafebepujo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9fe25a2---vevaregusedoz.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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 15020 bytes
SHA-256: 32afd252d1c028f6bafbf2801f47a7427b2f8cccfdeaca4b8ab0a636bdb5560d
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11220 bytes
SHA-256: 708cfbca0ed1bce16145bbc706bf96bfe73c17d1ecb74f0e8b181540464037dc