Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3212f6fc609da6…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 11:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd254e4ce7fe5b137b3e62f1cd1395af SHA-1: 7c69dfc372d0af45e41963a59aba8fc21911d0cb SHA-256: 0b3212f6fc609da6a7e859f6074961a5dc6d65074eb0292937f51fd2c3c63f70
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://nipisod.ru/award?keyword=school+attendance+management+system+pdf', which is likely used to redirect users to malicious content or phishing pages. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=school+attendance+management+system+pdf
    • https://cdn-cms.f-static.net/uploads/4421062/normal_604fc4232d583.pdf
    • https://cdn-cms.f-static.net/uploads/4470962/normal_5fda5514a0bfd.pdf
    • http://sendgrid-de.com/zelda_ocarina_of_time_master_quest_gamecube_iso_frk7g6o.pdf
    • https://cdn.sqhk.co/lojosewude/OcR6hjI/bepasajofex.pdf
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fcdac454792c.pdf
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ffa0526168b7.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_601fa92e4e51d.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60157413c7262.pdf
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5ffbd6ace3830.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fe90eb971ca4.pdf
    • http://thedefenseforge.com/what_to_include_in_a_film_pitch_deckv58zk.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_604467ffe8b1d.pdf
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5fe8a0a0c9039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_5893fbc832224c3cbbb064f727d8ea44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/289af70d-7c6e-4183-a67f-39a4ba60ec06/fios_g1100_speed.pdf
    • https://uploads.strikinglycdn.com/files/cd5dc380-3cbb-42be-a982-73ce370efc08/beautiful_creatures_2000_cast.pdf
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_d31ce1a75d6945ee9c4e6fd541cbb72e.pdf?index=true
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_7066b3daea7941fd8b8d7047fd20f9dc.pdf?index=true
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_b5293b1042ea49ef96486d1386b81340.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5aef66f5-b329-4639-b009-88fd436a205c/wafevalan.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_off0000fe8a.bin
7bf301445f624e603fcd347d98da56a10a6fefeb8f200e64410552b11db696bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 5676 bytes
font_01_sfnt_off000111cb.bin
a2c78009359dde0a6cfbf37ab2b38b6c6ff4faac03210b050e1760bda8665eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 11004 bytes

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