Malicious PDF — malware analysis report

Static analysis result for SHA-256 defafa2c85dccac0…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 18:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc8282d1bc409d0169cbe203f1273d18 SHA-1: d7e936753759244e7e3236844366d461796f6663 SHA-256: defafa2c85dccac01515d84a6d40aedcc7d2416e61dad4a2bbd5eae1ddbae909
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autoescuelatosal.com/galeria/files/vajubukumovomavid.pdf In PDF document text
    • http://fitviewer.de/files/file/dogulawuvuwi.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/tinapavobawofitijosovuf.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/gimom.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/88862567450.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/faxitadiwarulosotawuliveg.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nojufafozolewipu.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/sevisovidabesa.pdfIn PDF document text
    • http://benetalent.com/upload/files/lodujisogun.pdfIn PDF document text
    • http://meditopthailand.com/file/wofigikiwanukabisifigos.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/35912407253.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/bukab.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/54d6c5rku99jsf2q867a86u4o3/13492237113.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109191646127061.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/3496649796.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/133b4cc25842ea7574f46eb7537ecc4f/goxiwakedoronazojusolilip.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/28252427727.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210913_823EA3E4366577A1.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613f3e0a5e7cd.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/pozulirasufovagonotiwo.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/62101697741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nelson+biology+20+textbook+pdf+answer+keyPDF 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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 11424 bytes
SHA-256: adbfb00a3d686afb0fc3c0de13fcda053f4ef71114261e625d221094fe270050
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 15528 bytes
SHA-256: 4ef0a93356ce0c52bca29450c8195e06c950feb91147502b193aaadfc3e998a8
font_02_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1