Malicious PDF — malware analysis report

Static analysis result for SHA-256 414fc5120079fb9f…

MALICIOUS

PDF

94.6 KB Created: 2021-03-18 08:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98c21aa44a4e781c9e923ed39733bd67 SHA-1: ca52fbf88e9367d1bb33259d79a55179fea7a051 SHA-256: 414fc5120079fb9f8a0a8586c355accc563dbd16608bb905ce5f1fe32b839d23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs pointing to suspicious domains, one of which is used as a redirector for a link farm. The document body, though heavily obfuscated, appears to reference 'Avira antivirus pro cracked', suggesting a lure for pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=avira+antivirus+pro+cracked PDF link annotation
    • http://xinuvaro.sportsontheweb.net/69489687189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60388a0087291.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/B3Jvvjf/vugimagotogumomep.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/ihignjd/space_heater_with_thermostat_and_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63bb3485a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5fdbb5eb88176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_60007fba9987f.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/ifCjhfD/ghostrunner_gameplay_4k.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/el_proceso_de_investigacin_cientfica.pdfIn PDF document text
    • http://fetisaletom.iblogger.org/85152689590.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/ziaetgf/74507700144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nozozuwovore.atwebpages.com/zafapawonegekaxoz.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/epson_workforce_wf-2630_not_printing_properly.pdfIn PDF document text
    • http://fogetakid.rf.gd/guided_meditation_for_cellular_healing.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_bf08c995332843a4bdb6683409c63691.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_f0cd8c48e34940fe898448362a34ebda.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_8ce4a8e412a84c51883fc3fb5587b8a2.pdf?index=trueIn PDF document text
    • http://visunizuze.epizy.com/how_does_the_vw_dsg_gearbox_work.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_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 5148 bytes
SHA-256: 9668d9d7903b655fc6bb63f8542dde5d954f52d1396b3116565d32022d07333a
font_01_sfnt_off000147b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B9 10904 bytes
SHA-256: 8973f198aaa3bf6dea3493b76f46a9ad866ade905296177d2c4d51a527d9ad7c

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