Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d12eadc4f407700…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dca034787ad4c0fd085e900d200127f SHA-1: 34d4c6784093f0b70da82f2ad41a0458fa5d99ca SHA-256: 6d12eadc4f40770064fff886ae6ad04df79b63782959c0337c3dfc7be35d8c44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) further supports malicious intent, likely for initial compromise via spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.larucheapain.fr/ljk/file/mejukimabutudaluj.pdf In PDF document text
    • http://fongyoskert.hu/userfiles/files/72976194635.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/8203279819.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dugimagubazaxijari.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210916051359.pdfIn PDF document text
    • https://epiphanych.com/images/file/25131546718.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kulagowakaw.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902044228928986.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/terafewebiximavujugeviz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413ff63360c---27334833509.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21745337993.pdfIn PDF document text
    • http://quranday.org/userfiles/file/ramawodipeli.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/dejabojukokikeju.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/ridizirumejusekulufuzusu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fuvezodidewama.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/67972668190.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/widov.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/3775555768.pdfIn PDF document text
    • http://briztravel.com/upload/files/kuretatamodabivofep.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xenojav.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/6410592929.pdfIn PDF document text
    • http://belloverde.net/emailer/file/34523066947.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369139644cd---97705655196.pdfIn PDF document text
    • http://caramelitos.sk/files/7691441089.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/41608943218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+to+play+games+androidPDF 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10824 bytes
SHA-256: c799aca518a6159626839b83f97be7566503cd3838e88da0e86840258e374544
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 17876 bytes
SHA-256: 43dff507d45b46f7846723c04bf94e5cc93c1b34a39dc484c604563c4c14de1f