Malicious PDF — malware analysis report

Static analysis result for SHA-256 181e29c60a1dd5e1…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 18:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6327ac8434495a6861d32f537c4a9763 SHA-1: 7a83c8fdecd90302c8de08f08d46a24a648ef324 SHA-256: 181e29c60a1dd5e1ef0ffb846c93af0b86696c809638392d0df8109a95b50008
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying a link farm, suggesting an attempt to drive traffic to potentially malicious sites. The primary malicious URL identified is pelibifir.ru, which is likely used for phishing or malware distribution.

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://pelibifir.ru/123?utm_term=game+of+life+career+cards+salary
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/jadomikabonez-jokojogigex.pdf
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/171af1f24f68.pdf
    • http://napodosawukezob.getenjoyment.net/842089402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b8febf47-de48-4a6b-917e-886264438559/5th_edition_dd_character_sheet.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_9c79a26c68904873941b0b1706f0064e.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_55b2ad411c884d489d23bed2d4cce281.pdf?index=true
    • https://s3.amazonaws.com/luworizesupox/28540256729.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_5be26fb99f224a1084093be37d33a986.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aae0162e-16af-4ed2-a83b-6a411867cd10/where_is_the_ip_address_on_a_ps4.pdf
    • https://uploads.strikinglycdn.com/files/37ea878a-5734-467e-90d2-cf28e8e1d5f2/ramubewabunidotul.pdf
    • https://s3.amazonaws.com/loxopudizus/easter_bunnies_images_free.pdf
    • http://xijewixevav.onlinewebshop.net/81752430112.pdf
    • https://uploads.strikinglycdn.com/files/1afee81b-c42f-4bb3-8b60-ff88476a62a9/janonexoxa.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_a106de3809ba444c9fded895753484e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0c03eff-43bc-4fab-8d43-484664ca1f9e/80848957194.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_dc1baedab7a14c24891aeb98111ec787.pdf?index=true
    • https://s3.amazonaws.com/zesotat/43759790406.pdf
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_2678769b5b294706885a5aed5674ab74.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_45f6804d0e2748e983fe880d33095671.pdf?index=true
    • 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_off0000f9c8.bin
6e4b1b618e702eae182a5889adb53fcbd9be86bf148bc44c294be7621bb42081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5300 bytes
font_01_sfnt_off00010bc5.bin
f3b1fb1520c4239d282e6f9a8ef7b83bdb5bc4bceb38866976a3942db0fbfc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 11016 bytes

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