Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2cef0d93113bff…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 15:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de2dc4ff4e96f08715c30ccb96493c04 SHA-1: 3df94b3fd25ca3b8727c01841ce3e40369434490 SHA-256: 9c2cef0d93113bff0b18c7d6543d9b1b4a089971de838c9391f79df6b4f7762b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many suspicious URLs points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://crewmak.ru/uplcv?utm_term=offerup+apk+latest+version PDF link annotation
    • https://jamisonfurnace.ca/userfiles/files/62881124711.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/7199826773.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61668609938.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/sebamekoza.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/71540622426.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438ac158b12---69544725444.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/4292864782.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc43e2be0---46540800566.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/60451729092.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/pemurunej.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/puzikabizobotasirale.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/pemalenodepo.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/20495837007.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915155224225079.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/27295247621.pdfIn PDF document text
    • http://nktrading.qa/file/files/zurefisasasun.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/20181245879.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zezatipijelapisidiwa.pdfIn PDF document text
    • http://findacommodity.com/upload/file/kipewonelidenun.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/niwuza.pdfIn PDF document text
    • http://all-premium.com/user_file/files/26932808647.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/72593857520.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/52213014415.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/bixezolekasewojenuzibefu.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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10632 bytes
SHA-256: 7126af8b709c8fd3ebc57f71f5f77ffbf7e7d11fadbca66505f707db6f358754
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 17652 bytes
SHA-256: e760c4d2acb8f4d795a6bec7f46308cc088886a0bff6d1788d9454a0b7b23e97
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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