Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cc56cb4848d827…

MALICIOUS

PDF

105.3 KB Created: 2021-04-02 21:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: adb3781f1580cc4a6932f296846ab858 SHA-1: 0d17da26a5e700295d6b46d07e4f0cccefe345d2 SHA-256: 92cc56cb4848d827d4d260a6e3ceea94d04b1b5e419acca8e43a82ccecf62752
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is likely responsible for executing the redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nipisod.ru/wix?keyword=be+iron+fit+pdf+download PDF link annotation
    • http://dapovevi.mywebcommunity.org/basic_engineering_drawing_book.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/3062545.pdfIn PDF document text
    • https://cdn.sqhk.co/gogefaman/dDx9hbd/23674696772.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/5FLEjed/6230793193.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/Jehb4gh/banofakuwob.pdfIn PDF document text
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/e7a83.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/ralatalozuwugame.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/87880649894.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/sRy9hax/vutubobivemanatexixemibu.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/medabetoxosezokowema.pdfIn PDF document text
    • https://nobokoxevukaj.weebly.com/uploads/1/3/4/7/134755509/zepelel.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/1260bc3c-a925-4128-b0ad-000be6f1601e/fonimubivosevuziwuvogeja.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_dc40f11a903647d7abb934a351b87613.pdf?index=trueIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_e30ba03d20db4da0b99aa6087cecbac1.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_cb6248086f154b13ae3fb24028904218.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_ce9caa2e4fb545eebb3ea99ee5ac3f7c.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_881093195cb34745849aa768b1a8cec0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc38414-104c-4de8-8b18-db578fcb5a18/39698050264.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_7308af11611e4e0b9e270a722c8e1fe7.pdf?index=trueIn 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_off0001581b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581B 4996 bytes
SHA-256: c06affa7a2ba19cade6b135c11efb4791c1cdf68d34c0c3fd3a2aeeca6ba993c
font_01_sfnt_off0001693f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693F 14324 bytes
SHA-256: 88f85d941b371a821d6cfbdb1bc2b7295fb91d2c3f9958204f68469780fd0d0c