Malicious PDF — malware analysis report

Static analysis result for SHA-256 170391dbccc4073d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-22 20:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 105a5347e7a22632599a8ac9b3eea4ee SHA-1: b68ded0b0d901193ccf9e1e8d85ef9f81b3b0cb5 SHA-256: 170391dbccc4073d1db390fe14ffa0c71f6c0812b4fec37138aecae577fc68a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users to external websites, likely for phishing or malware distribution, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://coretry.ru/uplcv?utm_term=friv+papa%27s+freezeria PDF link annotation
    • http://heldermusic.nl/ckfinder/userfiles/files/92851404535.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/busovitusipa.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/59861064622.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/97709571101.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/powovozap.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/zoxowajadogukebukewete.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0c062def---88702938897.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/18322910063.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jumubavoridugafa.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74266203111.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/gojokajixugisekuli.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/73691031582.pdfIn PDF document text
    • https://baptistfriends.org/media/60020302411.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/12364859977.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/xinusatutumodurigexobubig.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kogejupuzobewipamarofirep.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bediwafejejaxotejagugi.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109202328107740.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/dupufame.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65786017467.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/60419351800.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gofajevat.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_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 17576 bytes
SHA-256: 71c5daaec7b75fa795f810691b58ece2f90548ed99dceb25b57894509394ef44
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10120 bytes
SHA-256: f152890cdf15dc87cebe204c3108ded71331cab7fbc0b72e04639358e279799d

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