Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81e5dff39d91502…

MALICIOUS

PDF

68.9 KB Created: 2021-01-06 19:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fb554edabdcd0e110b0c705da3d08cd0 SHA-1: d6f3e0775bd1544b0766539eb227abb2c1d0c254 SHA-256: c81e5dff39d915023ec4da3fab6c2d195f6e87d2d2dc92ba0d7a6863af7daf05
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafffe.ru/123?utm_term=i+know+you%2527re+dying+to+meet+me+song+lyrics', is embedded within the document, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffe.ru/123?utm_term=i+know+you%2527re+dying+to+meet+me+song+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fe6e894cb8a2.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/jamiwixajovezuxax.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/6181729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8d0970-632d-400f-83d9-6362c6cd3f28/king_for_a_day_pierce_the_veil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553615c0-5443-4c8f-ac29-0a2954354d7a/san_diego_unified_school_district_human_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f6bdc2-f446-4921-b056-7900d988b2a2/wijuraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2748e20-c50e-4104-815e-392720971b41/mp3_player_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bb320e-3a48-40b0-91ee-c9773e284fdb/a_world_of_ice_and_fire_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414f1495-2b93-4019-a11c-46a45bcaab39/cozyna_air_fryer_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1684777a-658a-45af-8819-944c8f28322e/775_area_code_zip_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2741a2f7-2b7d-4774-bba6-6588375871de/celia_blanco_manual_esoterico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a31a56-4d04-4028-8b10-10ee4ac93611/maromonesudiguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bcbf9a-4908-44b4-b227-28e33b7e5d08/ropogowamulowobuveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a771e-d0e9-4056-8d44-b796b50655f4/winonunibigeselafukobik.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_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 5276 bytes
SHA-256: 0d3889a17052502829c2bce67ada4b671cb3d416e01c6eb91ae4f110f7e40518
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 10808 bytes
SHA-256: 53e8b68ecd4eeedeb54655d70f5926f84da7e7b85e7f80f203be7b3f6f6b404c