Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c3984cd56e5388…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 09:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c2a79204a6b9d612a5af3de12cf0a76 SHA-1: 8718be88983f03d4d4566aee5c16fa90676b80b8 SHA-256: 33c3984cd56e538898e8abf3ab9e2bcc3e5470fef2fb042a6a6740266a8c5876
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18853702506.pdf In PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/28664002552.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/47767777319.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/86706664049.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/39563364469.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910050730.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zepip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/bojegubaxago.pdfIn PDF document text
    • http://temple.mo/userfiles/file/75691020510.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/pogujigoraziwimibidunudok.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/92102123395.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/7349615013.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/pedemijekuwaxajum.pdfIn PDF document text
    • http://www.bash.cl/media/file/lomafi.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/7950154184.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/10117720288.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/kewafaxakok.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/35388486470.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33010826368.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/28450700704.pdfIn PDF document text
    • http://edituj.cz/res/file/71599149422.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/92952485227.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/77866063897.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jejikaromojipimolexonijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+control+your+phone+with+your+voicePDF 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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 19464 bytes
SHA-256: de894cb5b921b594c2927d0174e1e81d41f5f9bd827b98bf85dddee64bd539cd
font_01_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 10496 bytes
SHA-256: 64451f9016c78bbfbdd2db14f503f6ac67e57d0ed8a05015ecd8b9094d1f701b
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1