Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfd04ed902ff92f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-11 14:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ad7b6da7d38bbe5811e1fe9abfea5066 SHA-1: 03d5fef6b15391df321df1cc55f2561f6746000b SHA-256: fcfd04ed902ff92f91a1c6921fcd2d24036258898b53067c3ff42a887fa1db65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The sample also includes numerous external URIs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=ps2+emulator+android+game+list PDF link annotation
    • http://finproekt-msk.ru/userfiles/file/danaveto.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/palowibagiwimu.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/rixiseviwinozaludenaz.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/32478197242.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/mujosi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/juzufagam.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/51112085873.pdfIn PDF document text
    • http://specialcats.nl/media/files/53502568562.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/refotorutujilonum.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/82357857442.pdfIn PDF document text
    • https://tigaintan.com/contents/files/62539627926.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/96130481508.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/1070492258.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/83776978865.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/38803891795.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/26996630640.pdfIn PDF document text
    • http://flomogroup.com/upload/files/zigewiwamodadikegelo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/70034702538.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/66611063478.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bpspeu0b2mlfj5324hh82gt1o7/xidufupazafelafovuwuki.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/75138990578.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/31984176907.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 18444 bytes
SHA-256: b1dad04872f7a3955ea4baa0efd37a1cd07ce5f480f4c3373154e9931cfc0170
font_01_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 10812 bytes
SHA-256: 9626d87673965570b04fdf08bc1408991359b577adc59bd5b7ef76d407facc96

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