Malicious PDF — malware analysis report

Static analysis result for SHA-256 3325b02d0749f33a…

MALICIOUS

PDF

79.3 KB Created: 2021-04-11 01:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7aecaad7597d28c1d17ef8789c2fd30f SHA-1: 918f88d6137f869722fd8eb5d403dbaabb0562f5 SHA-256: 3325b02d0749f33a6560c6ff2a91e517fefe2c7391e2afb22c89ca90e75f38a1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=tipos+de+corrosion+electroquimica+pdf PDF link annotation
    • https://cdn.sqhk.co/wezufunin/1icjbLC/32875750531.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/fijux.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/the_gun_c._s._forester.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/96d87f6dedb.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/hbFuhh1/biogeochemical_cycles_webquest_answer_key_phosphorus.pdfIn PDF document text
    • https://rokojilezel.weebly.com/uploads/1/3/2/3/132302907/a09b0cf.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/ijf5yhi/16031812925.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/luzeba.pdfIn PDF document text
    • https://cdn.sqhk.co/jobasalem/hcjhbZy/pujavofixagajekiwupo.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/novel_drug_delivery_system_books_free_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://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_52524aa18bd941c3b535db2c6820acb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/internet_browser_software_for_pc_free.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_18284cd3ef5a4bb282c2519ec484d4fc.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_4c956d736ab2414fb421d98ac44ce60c.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_81a413e9984b46cf91080700518b4010.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/expression_helen_jane_long_piano_sheet_music.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_9ff1701701234a1cb262fcbcd3a223dc.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_547d3a62b029460e8598ac7a69437b66.pdf?index=trueIn PDF document text
    • http://zakexukosogu.atwebpages.com/70942421126.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_b0806903a42b40e4b763881668c11020.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/operations_director_salary_uk_construction.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 5256 bytes
SHA-256: aee3e6b11d0ea07cf0b09e4df1ac661180406e56f703f412715f3e8582badceb
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 12036 bytes
SHA-256: df921fff2583e359829adb6ef0baa993af360ba3a1c1692af4707e318f0688de
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361