Malicious PDF — malware analysis report

Static analysis result for SHA-256 58857a391345aab5…

MALICIOUS

PDF

71.3 KB Created: 2021-10-06 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 166d3c2991a36e0971e5f87abe6c7d16 SHA-1: 3676ce03c62630a77ce7002977c5e83aeb8ab07f SHA-256: 58857a391345aab57e821d8f9c12d6dbe16a99d2a949eba1fc679b5a245c491e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=amel+yachts+for+sale PDF link annotation
    • http://5thaveseniors.org/userfiles/file/bofomab.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/70337982073.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/83533695869.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/pekexagofetavozaxeni.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/97468305057.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vazowafepiparu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3c7f8e99d7c41a57e86579632a58f337/fufojizimu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/76687515692.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/zanarujib.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/26824786382.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/71717400598.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/85788606472.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/burigemedat.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/kapadufoxujiwajuru.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210915081224.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xabitumodu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gelewativufukiwagaxefo.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zejozaxopumarapaf.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/61189891001.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/35908450363.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/71062838517.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/22038744772.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/lirixu.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 15640 bytes
SHA-256: ac33e2bb75f2e7c08220f82ada80e657bdeeccf53a992521d6fbeb22da1d86fd
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 10500 bytes
SHA-256: c8cb59a1258673d1fe29221660066714ca1dbffe85d6f07ce15bd48256ea4bbe
font_02_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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