Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3712bd8660bd797…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 05:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1910cc676aa31e4b5f0de1c7b51c5fe7 SHA-1: 7885e6d76c1c3ad3490b7251cd61adb4f9e02b17 SHA-256: c3712bd8660bd7972bd3c05ec1683f3fd2ab801986e9877e797cc8f45a692cc2
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 SEO-optimized and point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=latitude+and+longitude+worksheets+4th+grade
    • http://feyakast.online/what_order_should_you_read_the_rick_riordan_booksgs407.pdf
    • http://reactivascotia2020.com/sedaziwukelezefakey29.pdf
    • http://braco.ru/bubitewonafua4ld.pdf
    • http://inertbhjbj.ru/dauntless_beginner_guide_20180p5re.pdf
    • http://rumudasejozekes.iblogger.org/how_to_read_stock_market_patterns.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_9f7f2a0790ac4520bdc886dfc42bf203.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a988105-b5be-40c4-bf4d-a9d3419e408a/funny_short_stories_for_5th_graders.pdf
    • http://jisufosesuku.epizy.com/50815356201.pdf
    • https://uploads.strikinglycdn.com/files/0d75ac3b-fa6b-46d5-af31-ca9ad1737ad6/lepepopuxewo.pdf
    • http://zejizarizigoz.epizy.com/jesorixojugeweto.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_55a02f7b9513402e86a4fa65472d0d1c.pdf?index=true
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_a1ef3d63eb2c422db4dc4f60134066a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0cb3fe6f-ae2c-4072-926b-0b47d004c186/are_there_any_living_cast_members_from_gone_with_the_wind.pdf
    • https://uploads.strikinglycdn.com/files/5715f737-0327-447f-b08a-3a8e6e3e0488/how_much_do_medical_laboratory_technicians_make_an_hour.pdf
    • https://uploads.strikinglycdn.com/files/79bfdbb9-b892-43d9-abde-237aaf86889e/79574652187.pdf
    • https://uploads.strikinglycdn.com/files/e84d176a-aebe-4a27-a93c-047115a00da2/verizon_wifi_modem_setup.pdf
    • https://uploads.strikinglycdn.com/files/dd2adf2d-2ae6-48f5-84ce-e1b8f4021470/what_are_the_negative_effects_of_modern_technology.pdf
    • http://nasukenapab.epizy.com/law_office_manual_template.pdf
    • https://uploads.strikinglycdn.com/files/114d0ddc-cbf6-45b3-8d01-deb9d530cd36/how_many_sweet_corn_per_acre.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_e20527bc997f4ae0875b358234e9e2e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4eaa37f6-bf1a-4699-a9df-035ea82b4a9d/46005072207.pdf
    • https://uploads.strikinglycdn.com/files/b94f3a66-0fa7-4a88-80df-b4b565980494/what_is_distributive_justice_in_healthcare.pdf
    • http://vajowulidaxunit.epizy.com/62113077054.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_off0000e872.bin
9d7017ced647e9ec90c2bf75d0c03884e0d6d2de1ce19ba1b35604f38292f6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5272 bytes
font_01_sfnt_off0000fa74.bin
a03af98e358565340cd2fbf77608106fa6b7f5ae0fad48906ab9933274a689b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 11968 bytes

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