Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44f46ac8b326a0…

MALICIOUS

PDF

133.6 KB Created: 2021-03-24 14:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3a48d63d900175195def66ff7458565a SHA-1: 55f0ca66a5c3ba4125b997d8df627ba6ef0a1b66 SHA-256: 4a44f46ac8b326a027a8543c9da9f2d0ae75eab3fd62b4e1241bcc3b754289d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=los+canones+de+dort+pdf PDF link annotation
    • http://winoxolupuvil.getenjoyment.net/kidojiru.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/megitemorobiwugoliri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6038b6386d1a4.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/kenomimikubatezodizi2y2s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6015692d39632.pdfIn PDF document text
    • http://togaxifobuf.mypressonline.com/47973258603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_6046542686927.pdfIn PDF document text
    • http://varuzajuv.22web.org/diy_large_format_camera_lens.pdfIn PDF document text
    • http://wexexazemulo.iblogger.org/chokher_bali_novel_download.pdfIn PDF document text
    • http://3gusevshop.space/python_for_finance_analyze_big_fina31qcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_604480e4e27ce.pdfIn PDF document text
    • http://tedalaz.66ghz.com/muwapuwofometokaramote.pdfIn PDF document text
    • http://itactical.xyz/watts_per_meter_squared_to_temperatureglz4y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_2c816eb09e2a4a1db58146788be39332.pdf?index=trueIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_9da074e95a714de4a8f752b75a2d0dee.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/81353499088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5c7946-1252-480b-bf01-d547d825b5a5/belawar.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/momusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd962de-c530-4b04-ac98-ea11ac5ebec1/38496323083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aceb8cde-95be-4296-a39a-3efc9ac6a0c0/dokevefapemenawitamin.pdfIn PDF document text
    • http://vorenetizufumuj.rf.gd/7984833993.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF5C 5056 bytes
SHA-256: 2ddd6f3f22c97e277c33b9466d241f7696986fcd7b91b55e4e3bfeb2211742ac
font_01_sfnt_off0001e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0A1 11932 bytes
SHA-256: e946b067a2bb42c2b9342f4de686e13f69e63773316d3d1ba0931cf81ad0d626

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