Malicious PDF — malware analysis report

Static analysis result for SHA-256 756ac90c0b289288…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2ffa806e2b89cf06a71948d90c8711a SHA-1: d64a65145b1723c50766ab2971da6db1dee2b2f1 SHA-256: 756ac90c0b289288807726f7cdb002c064459df23a1069635024886c087b5a1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=happy+birthday+in+canadian+french PDF link annotation
    • https://mingyi-lock.com/data/file/userfiles/files/60708106127.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/63188571639.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/24753512724.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/bipozexegevenadajaduxadi.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/salizenotomopiwevipezo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/90039393171.pdfIn PDF document text
    • http://adice-area.com/pictures/files/21137135572.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/zagudukazuko.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/xaguvubogo.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/71014188714.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71181018568.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/desuvebure.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zisukibobako.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/nizaxi.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/lanusilema.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/41370289895.pdfIn PDF document text
    • http://marymo.ru/uploads/files/18194516160.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sabanavoso.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/nuvuravexegagose.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/toxaxuximadoxufunuk.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/36750704006.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/garewajutaf.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/gusap.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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 10628 bytes
SHA-256: fa1efa7c60119a901a5962a141aa1843ae6c81a3043ed21a92fd41f4f10c5040
font_02_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16452 bytes
SHA-256: 0b895f06ee7ea873e1bc6e76cf897c8fc77dd09aec36073b49ce55bb890f05e5

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