Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ca96ed497c6738…

MALICIOUS

PDF

76.3 KB Created: 2021-10-03 00:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0152987808e09dc8674ac1d589d643c3 SHA-1: 7e42231780f5b208ec141859710fd18f27bb74c6 SHA-256: c2ca96ed497c673848d928d216fbdc0d623d5fea02d6fcd5f88e455248afffb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate a potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/90200862749.pdf In PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/23909601812.pdfIn PDF document text
    • http://bdnchem.com/upload/files/11832294708.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/napewigosizezogozizi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/worusananobegogenilezal.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/3860957130.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/25163767382.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/42676658051.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/8635184220.pdfIn PDF document text
    • https://partnermind.cz/images/files/wirafalasuvepajepimelakov.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/94217811089.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/baboziguxififukeb.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/21603763554.pdfIn PDF document text
    • http://idroter.org/userfiles/files/21196748035.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/lasuwotavogimugepuji.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/37199398242.pdfIn PDF document text
    • https://equimat-cheval.fr/file/21695963446.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/niwoturabika.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5b5553665---nibot.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/kidapiperadupikepasabivi.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/dulelegogawerimiro.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/28459786885.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/14657819344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=periodic+table+class+11PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/viwodomagumitomegiv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 10452 bytes
SHA-256: 1342cf1247ef5f1a26a252be49bd0577677e2a5a67a7a3f03420c988d2241e0d
font_02_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 16384 bytes
SHA-256: ce4dbb10b22de6b901f52f0d89dd1818b1be9ace0f7f170175c3dc2053dc6db9
font_03_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684