Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23214a208ef3a9a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 16:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce3c0e78d274d87caf9af99df9ba5926 SHA-1: 741eca485867192e83ebf09a589e2b5fdbca5f2c SHA-256: c23214a208ef3a9ab2e33e76c07a6cd6da8a1f141fc980f4b4cfcb5ea5002a31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging T1059.007 if any JavaScript was present but not detailed.

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 https://allytemp.ru/uplcv?utm_term=good+phone+multiplayer+games PDF link annotation
    • https://nicklason.se/ckfinder/userfiles/files/walebawakaramowesomolan.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/27974721336.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76451238602.pdfIn PDF document text
    • http://sunway.me/uploads/file/151035226654.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/13888829803.pdfIn PDF document text
    • https://onlinendttraining.com/files/tokowebigasesusok.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905230937.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/moxazilujopudu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e3cb7af61e063ab7115389a09b22319b/23082491722.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18206856998.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/fimejusuduwi.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/91417747240.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/widuxibezu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xolafunakezekupijukedozo.pdfIn PDF document text
    • https://superpart.com/files/90742660201.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/14968981073.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/99608040626.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/levutaduzonivuzole.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/31729301554.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/79592274739.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/32568280839.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/fezusinimipuwegifem.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/bovudow.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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 11092 bytes
SHA-256: bef68eb87a8fc22d49e4df691e8f7b7a7990ab53e856cbb0a26b5c5c689c3f0a
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 17408 bytes
SHA-256: aedb3d07351d2964c79d4382e3f4f9deaa4ad2f03c22c61e2e8ee18aa9e6a7dc
font_02_sfnt_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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