Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd74fd4c008b3e89…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 11:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb5046b05a28615a4d3f427992945ff2 SHA-1: a717de175bd939c0f9a12d847b63a88458c25cd4 SHA-256: cd74fd4c008b3e8950567c7592f8e1360cbe1a0f2d16c4f3ec3d126b988652a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=good+self+introduction+sample PDF link annotation
    • http://speckletrack.com/update/editor/file/teradubigiz.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/jinux.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/24538479515.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/puwiseronif.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/25346390781.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/xusifamatetoma.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/nodororuvubidomipowogex.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/fumad.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20211002234757.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/rugivoz.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/nedasaguribolu.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/newoj.pdfIn PDF document text
    • https://banghenails.com/upload/file/83985204733.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/jemixepuwuxikirozulok.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/13373476424.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/medokulafo.pdfIn PDF document text
    • https://aashianarealty.com/file/dudezogodoj.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/jedoj.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/jenojapot.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/ruwejafusal.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/45300561499.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/sofagamagomewisinuwiz.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/2459952085.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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 16984 bytes
SHA-256: 93821b3e51f6a4f3e0c2ec1fcfb1483c4ec594ca19b79526c300bcbee5bbf92b
font_02_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10920 bytes
SHA-256: 0ccac2a3d987e729b441be1fae820fee10ad824e0b59c16c2ba1a265e9354b52

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