Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75f45d6f75ba184…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 14:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0cfe25f79f8d346844bce679691bbf3 SHA-1: 3983cc4f4ce71903ab70f01cd41bc742ff6a26f7 SHA-256: f75f45d6f75ba184927e31122932580bbc489c9a2920595d71a68308f77596fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests an attempt to redirect users to potentially harmful content or phishing sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://peknanevesta.sk/media/file/56026487575.pdf In PDF document text
    • http://sozopolihills.com/userfiles/file/45952059699.pdfIn PDF document text
    • http://sdes.in/uploads/96663933974.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/94921127236.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/90600844950.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rowize.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/mapegivorazupekunoxog.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/jonutijevafewifazijetin.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/15534728870.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a553b6218---sokifugitonoboku.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/gotuzusovodunixapifomalu.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/pigunu.pdfIn PDF document text
    • https://lasanisports.com/files/kuwedoxob.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tekufojotuz.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/72517023977.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zaxigatojurawabapazuwu.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/18471442437.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/niwakudajijuxoverijus.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/pojanomijolosulupa.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210919234656.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/xakafi.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/48949820730.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/71931056069.pdfIn PDF document text
    • https://0900107678.com/upload/file/xumalazasosaselefo.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/popigerosunexigudu.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/25197341247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mezcal+made+fromPDF 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_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 10228 bytes
SHA-256: 5067e235d3cb7033cd70475eebf7ce7f4fbec9ab1af744cd70ea191123f60d92
font_01_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 14244 bytes
SHA-256: eb41813c27bd98699687ac159db0981b575170891c8e745fe1c50385937bddfb
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1