Malicious PDF — malware analysis report

Static analysis result for SHA-256 4492edd337346606…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 23:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a49a21e83533312b19bb63a6f2f1ebf SHA-1: a3b38f8b2e426b255cb828510876bc5e51d59480 SHA-256: 4492edd337346606dfa32b9ef693a7740d014dd29007bc4966e23c5c0cb78016
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://oreade-breche.fr/userfiles/file/dubufemideniwazuloga.pdf In PDF document text
    • http://mamaskitchenorder.com/uploads/files/45823011619.pdfIn PDF document text
    • https://5uempat.com/contents/files/17896263222.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/30963159371.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/51424847961.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5bd9fbe8---newuxefageronufad.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/26844378623.pdfIn PDF document text
    • https://bnovum.hu/downloads/bivupibapimevalak.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/59577463136.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zebofotunekasozipelodem.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/42304319878.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/49251848332.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/lunutowibu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/33072184819.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/21851494085.pdfIn PDF document text
    • http://devison-matras.com/upload/file/zosukaniji.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nejeritebupefajamerawu.pdfIn PDF document text
    • http://goref.ru/files/file/siwamolazolopokoruj.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/93s2knslg3n34klke0mh1epp85/bugikuwijuxuwevanixo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/61352062351.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/57976706582.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/kosaru.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/waxabisemejivikawajesibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nitro+nation+6PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 9900 bytes
SHA-256: 259a9551347da0d7bcb4a9a50f3248098b93f9761d8f0ad57fbf115fa144527a
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 22000 bytes
SHA-256: 04c7ac0c5b54d44e97f69cc633e73c145d163889e88cbd5625c2828513fb966b
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16104 bytes
SHA-256: f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7

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