Malicious PDF — malware analysis report

Static analysis result for SHA-256 926bac6a6e95596d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebcf083d2a5d054a651a40ada687faff SHA-1: cc2a88a1ab37045068068568c8f6636b9b5e2387 SHA-256: 926bac6a6e95596d86320b119631d10cb8fa14eed10804de3853747e10786a23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, suggesting a redirection mechanism to potentially malicious sites. The document body was heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to an attempt to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=tiger+snake+life+cycle PDF link annotation
    • http://kolbiko.com/images/uploads/file/ziroriduwasijam.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wubarebabowenero.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/57159766084.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/71637852687.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/jirakifume.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jaziwifunupotexike.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/41948200630.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pevebewat.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/wijokijexuzolilakerupono.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/90989547161.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/donenuko.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6130d3234d80b.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/17806214622.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nosama.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210909/16311596964687.pdfIn PDF document text
    • http://strandedtattoo.net/file/8145165116.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/fubepunemapa.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/49301308944.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/nosakefoponir.pdfIn PDF document text
    • https://afma.pt/site/upload/file/guwuzubesoxogejigosi.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nevarosenabomasonalamo.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/15855260445.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/28721189399.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/natawinabebowal.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 17836 bytes
SHA-256: f842237fc90eed2b325d050f67d890e017da7729cac9ea3ece75ac7afce7c324
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 10460 bytes
SHA-256: a05383c798d441cde25b327862ba51d5cfd610f1bdb36c401cf99901de142842

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