Malicious PDF — malware analysis report

Static analysis result for SHA-256 242194ab7df465d2…

MALICIOUS

PDF

71.3 KB Created: 2021-05-26 09:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fef176f995c884da13dab8db6ef54bd5 SHA-1: 72b0deb19f7d5d7b2a76843899986b658a970356 SHA-256: 242194ab7df465d29c519473629195afc02d19ea53e65fb4794f579857b2e3a8
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+write+a+formal+business+report+example
    • https://wibawamo.weebly.com/uploads/1/3/1/3/131383294/4853583.pdf
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/vapoguw_detavusupurajer_nosajixamibal.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/rapagufijan.pdf
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/8624809.pdf
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/2573396.pdf
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/9220177.pdf
    • https://texupofomisuz.weebly.com/uploads/1/3/4/2/134235579/1959171.pdf
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/nemosorad_nixapusileket_noxutuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/goveruduzewoxu/trabajos_de_amor_perdidos_resumen.pdf
    • https://s3.amazonaws.com/zatasipezeg/rasevewuvipifufan.pdf
    • https://s3.amazonaws.com/gidibesuxi/2063866745.pdf
    • https://s3.amazonaws.com/widetunipet/albertsons_grocery_store_job_application.pdf
    • https://uploads.strikinglycdn.com/files/684303fa-a734-4a20-bcf0-cec5899622c8/cooking_merit_badge_worksheet.pdf
    • https://s3.amazonaws.com/vovuzize/acer_aspire_v5_battery_replacement.pdf
    • https://s3.amazonaws.com/gonima/lebexabubafurutakaxejo.pdf
    • https://uploads.strikinglycdn.com/files/496a039e-da4d-4c8e-9555-55f9f0e15a37/orion_cooker_rib_eye_roast.pdf
    • https://uploads.strikinglycdn.com/files/eb5d9557-aaf4-4a89-b69a-326de885d1a2/5181197779.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfb.bin
ef258bd160d1a3222c78318b85fab0e80c6e04e160314558ecbe4ea246673809		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5308 bytes
font_01_sfnt_off0000ee06.bin
0136d62e58b9c0f22dfede4029bdf77583227c546a25365a8fbdaaa1e4ded8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10052 bytes

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