Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68d77f23acb528a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 12:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d7eeceda14d5508937ed939c99ed83 SHA-1: 2c5c5af63eb9be65bf2fd56c44050608dcce569c SHA-256: c68d77f23acb528a04400c4cc457c5067c2197867d051f92d5f558057b280b29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external sites.

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://ponafet.ru/strik?utm_term=data+analysis+example+in+qualitative+research
    • http://manovina.mypressonline.com/sat_subject_test_tutoring_online.pdf
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/9475544.pdf
    • http://tokiridevifo.medianewsonline.com/admin_manager_duties_and_responsibilities.pdf
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/piwosimewakaza.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/049a0ab5a.pdf
    • http://mebevevi.mywebcommunity.org/bolowaxitejumixuluno.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/arm_knitting_instructions.pdf
    • http://sawemawe.mywebcommunity.org/71807330100.pdf
    • http://bidetoluji.getenjoyment.net/wasatakifen.pdf
    • http://betijeduw.getenjoyment.net/massey_ferguson_parts_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4880470-6fd8-45e9-87cb-bea7a3bbe895/the_merchant_of_venice_movie_cast.pdf
    • https://uploads.strikinglycdn.com/files/d10c7c9f-73ec-4a50-87af-eda82ad49d1a/zubumudadami.pdf
    • https://uploads.strikinglycdn.com/files/05a04da0-1365-4de4-a0e1-7b996e711a0c/how_long_does_it_take_to_become_a_reiki_healer.pdf
    • https://uploads.strikinglycdn.com/files/26304a79-bcad-4fc4-91cd-5bad545e50c3/41224951796.pdf
    • http://jasunusemoki.onlinewebshop.net/811507308.pdf
    • https://uploads.strikinglycdn.com/files/f8399828-962d-42e3-a9c9-182b302dde37/spring_framework_certification_book.pdf
    • https://uploads.strikinglycdn.com/files/1741399b-1bd6-4d5c-ab9b-e3a38bedc268/tuwap.pdf
    • https://uploads.strikinglycdn.com/files/3acb97b9-81a1-4f89-8109-c23ba56907f7/thrawn_comic_book_series.pdf
    • http://fuvamawijivef.atwebpages.com/math_games_download.pdf
    • https://uploads.strikinglycdn.com/files/ea35489a-b655-438b-92b3-89c1241e6be0/xusafanobufoxolevumorovo.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_off0000f3b3.bin
a21954c8b99ab4a3a990625875d1ade9d4e24a932572cf4542d3110b968527d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5528 bytes
font_01_sfnt_off00010672.bin
d06d69346b1f2a0d30b9832945eca54424895ff5cb646421fb497018ea42e65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 11432 bytes

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