Malicious PDF — malware analysis report

Static analysis result for SHA-256 756792c597936fdc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 12:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95f6386c50aa846baef446203d1a2ffc SHA-1: 13e6603390bbb777d56aac185d8aa6ece321f19c SHA-256: 756792c597936fdc42ce5935c045cb4e851ad55839247395d0c9e54ecd0003a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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=watch+chaos+walking+online+free PDF link annotation
    • http://picart-personal.pl/fckupload/upload/file/78616320413.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109040450499362.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kitesefixujap.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/jiguvijodofukutagidako.pdfIn PDF document text
    • http://theponghop.com/upload/files/danedukafu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wigatafukudozarudut.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/givafumaxizilebugijurej.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/suwuto.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/repalefovetixuli.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/15888507766.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/12583922829.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/wadus.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/59274713471.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/81152367806.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45585666485.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/75407282698.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/ramelix.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mufefu.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/47569212156.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/44583748588.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/zasibaj.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/1914486236.pdfIn PDF document text
    • https://777mto.com/contents/files/wuxozibusebepiduf.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/6389358563.pdfIn PDF document text
    • https://svltv.in/userfiles/files/74554454487.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 17620 bytes
SHA-256: 26849a4790918202b4381f91dcde5527219b40b9df259635019ba3a74a9dad9e
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10788 bytes
SHA-256: b18170aa74ec0d145961cd796d032371cf210f804d2003622ededaf9f266181d
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1