Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aa4412f951ecdb…

MALICIOUS

PDF

69.6 KB Created: 2021-04-04 16:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f302ac6bb4eca2847fe7ee3aa7ba6b6c SHA-1: 95e60f6fb5c7f26b9575de084d6be999d2dd549f SHA-256: e5aa4412f951ecdb535f31e9104c5c33318b4cfd033d78386920ca0fdcee012d
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 are hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, and ClamAV identifies it as Pdf.Phishing.Trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites, likely to download further payloads or harvest credentials.

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://crophysi.ru/award?keyword=descargar+biblia+de+estudio+en+pdf+gratis
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/nefepikamot.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/2705532.pdf
    • https://cdn-cms.f-static.net/uploads/4495536/normal_601d2584887e0.pdf
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ffaacb37c940.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170aa454426.pdf
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/9518318.pdf
    • https://cdn-cms.f-static.net/uploads/4504047/normal_6022d8453735c.pdf
    • https://cdn.sqhk.co/lupobikud/PO2hbhc/monstera_plant_nz_care.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_6014b012263bd.pdf
    • https://cdn.sqhk.co/gobisofokox/SCMhj8O/places_to_get_bubble_tea_in_london.pdf
    • https://cdn.sqhk.co/mozozezowos/4iaX2hj/basic_electrical_engineering_quiz.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_6059d7328747a.pdf
    • https://cdn.sqhk.co/bomoxale/fahilii/amazon_golf_clubs_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4da9d5f3-77ef-4510-8cea-de70a01efec2/light_pilot_on_water_heater.pdf
    • https://uploads.strikinglycdn.com/files/7028f5c5-9020-4f92-971a-ddef1a412849/pokutib.pdf
    • https://uploads.strikinglycdn.com/files/fa37a53a-1cef-4e3f-95f6-6ee67e03a64a/lost_books_of_the_bible_amazon.pdf
    • https://uploads.strikinglycdn.com/files/67dc604d-5872-427a-af11-3a179babdb69/can_i_use_a_sandisk_with_a_mac.pdf
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_0f7d625aeffa4ecc987bb8ef060e0396.pdf?index=true
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_31d69bac46444a85988c40c7e54f811b.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_off0000d1bd.bin
4656e2932bc584b804ec265eb3e1ee28b3ace236a75087e271f1c6c34ae3153a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 5464 bytes
font_01_sfnt_off0000e462.bin
a9cedbfbb68532a2b4d3fe024559bd2e24420f5ea088d7f2883c765d11da5de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10624 bytes

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