Malicious PDF — malware analysis report

Static analysis result for SHA-256 672610cec369d10c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 21:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a40daa14b9e3f737ae117a77925111e4 SHA-1: f443260e55c0ae76a4524370df58e5ec164f18dd SHA-256: 672610cec369d10c4e1d4c76adf1d9e883b9eb3095346154eef763e726711d54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=score+hero+cheat PDF link annotation
    • http://kuppersbusch.hu/userfiles/files/takeba.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/30738051037.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161418c9643b09---dabofelakagozobukepe.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/ronigifopinebeparif.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/42088312739.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/razakavapafomuxatawaja.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/lenunatinedamaminot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9101b56d---nebediwifozajukukivozu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/mofotajibife.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/6652200309.pdfIn PDF document text
    • http://napiarsaigh.com/images/wuguwoxaviruf.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33612105929.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/vimodatip.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911112758.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/6359578218.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/wefiwowitisazezebepowi.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/2535199164.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/mevatanetomojonefenuxebos.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/porulolovanevo.pdfIn PDF document text
    • https://mavibusiness.it/file/85948605819.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rupixekesew.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/92238830924.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/wirajimibife.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/80474404650.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_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 9992 bytes
SHA-256: 47c0a9aa69fc5cf4b6b6fad69e67b1cb0261e4f15d2c878f35561bd4724388fb
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 17412 bytes
SHA-256: 800f3c6ebbc559293212d43e8ca4b163d83d0078bcb5bc1a6f1caac143a18c10