Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227eb8d1388cd34…

MALICIOUS

PDF

73.6 KB Created: 2021-04-03 10:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc12a6bdd42f62d26544b2b2512c91db SHA-1: 905d1351395028671f1440a7495f50f8274e93cf SHA-256: 2227eb8d1388cd349781c9ffc13e41c921a2ef9cf254f647292c759a92da02f5
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, with one prominent URL being zajinet.ru. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded content, though heavily obfuscated, likely serves as a lure to drive traffic to the identified malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://zajinet.ru/wix?keyword=skydaz+mods+1.7.10 PDF link annotation
    • http://vazaferexadamaf.22web.org/capricorn_man_secrets_free.pdfIn PDF document text
    • http://koxodalepep.iblogger.org/algebra_structure_and_method_book_1_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wozowuledij/vukaxisejex.pdfIn PDF document text
    • http://fefemegazo.rf.gd/sirokawabuzowokisadata.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_960f783ecf3e4f919d0428ab72888213.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/alsons_aws_information_systems_inc_contact_number.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_3e211120c5204a958209f85218bdaa42.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_4416d453c1094e1e8e495ac2570c787c.pdf?index=trueIn PDF document text
    • http://fenulujexita.epizy.com/fokelovelo.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/how_to_use_taylor_series_on_ti_nspire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b10dae3-d6bb-4055-8e1c-3d744e669920/what_is_coding_and_decoding_in_logical_reasoning.pdfIn PDF document text
    • http://jedenibiripo.epizy.com/konica_minolta_bizhub_c458_brochure.pdfIn PDF document text
    • http://rowomasogig.epizy.com/adverbs_worksheet_for_third_grade.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_0fea281cae854b9883f928fb8e9aa504.pdf?index=trueIn PDF document text
    • http://kitivej.epizy.com/75645071640.pdfIn PDF document text
    • http://xowupetakesa.rf.gd/vudejusutefup.pdfIn PDF document text
    • http://zojimako.rf.gd/sawagatulagidifag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b65b69-d877-4c86-b1c9-dce529c9d500/boy_scouts_of_america_store_atlanta.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 4904 bytes
SHA-256: 84ed8b6cb33508407e675d29f5c11d522bb89741e13df1446822aab1e4a9d38b
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10772 bytes
SHA-256: dd9af2cb1c47fba3855ac61050a6f9f9aaff88b417eb29e5a2660c3b557716af
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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