Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedadb47f98e70c9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 20:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a316b5da8ee9dd3c365d29508f92710 SHA-1: e094aaaa2e688370aef0a848047fd1e0557dac0b SHA-256: cedadb47f98e70c9e8d5ed8ead9cbbc3392e5359cd33c03bf26d11a94a6dda5d
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 point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://kondicionery-vidnoe.ru/upload_picture/file/zajisejakozagagezedufeku.pdf In PDF document text
    • http://youngdongtec.com/userfiles/file/zajoteruvifozot.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/79517437794.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nipumosufume.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161323d4670102---88517635000.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/52630007280.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pewuvijuzekufiwavaxasu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/91450164239.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/93406809040.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/58859730098.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/futodovegalamo.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tusupikewedubodupazuwomox.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/fiwug.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/79535822498.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/kidogoka.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/86116631372.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/35819510656.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/kutetopalu.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/14138143956.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/viduxonizogej.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109041226127899.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/25065964792.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/bamarapujeramewonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+amazing+spider+man+1+game+androidPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 17888 bytes
SHA-256: a479011e25667108de867393aba73662555c14363ab3ac553f64866a7027ada6
font_01_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 10768 bytes
SHA-256: 35d987fa09a0494f505de46d13a3bf9576a224d9d5a07a4a17bcb5504fcfcc1c

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