Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec77051da2683d5b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 22:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 203dde640df348f1afba1af9de911d86 SHA-1: 3c4a8553d15b967a30c79983bee5f4a790b46d10 SHA-256: ec77051da2683d5b32c843252a6ed1d2fe5263fdb3a53a2f8d5850ead2431bef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and URL analysis suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hotechike.com/files/files/pusuliwesefutobusuremuj.pdf In PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/52008169693.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tupuzinuvobixapurugaxom.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/91907531897.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cc24ffac9d199626e0a2c7bf199ee8a8/pajutesutavula.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/godemudezapimigiroge.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/nejuradidifowoz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613597518282b---vekokep.pdfIn PDF document text
    • http://stl-hk.net/userfiles/72254154736.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/pazurizit.pdfIn PDF document text
    • http://sinostandards.net/upload/files/51175977404.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://kpdb.org/userfiles/files/43741066735.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/gavedizetisomivor.pdfIn PDF document text
    • http://erex.hu/upload/file/wewugusezovopekebo.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/38423075811.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/5299204535.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mibozegodawomovobu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/jozede.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/56959621917.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wibesaxozebukule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sun+tv+serial+listPDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 20096 bytes
SHA-256: 655970f1223227699f352a9024141e4196aad25f2b59735a7946d3f88ea4c8f6
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 10220 bytes
SHA-256: c1f70e59c072857d83f9200b63ca4384525bcc9b452dc5cc5a7b2f6df75bc788

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