Malicious PDF — malware analysis report

Static analysis result for SHA-256 7376a6a37a0023d5…

MALICIOUS

PDF

111.1 KB Created: 2021-04-03 02:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ed30f73fd048ec0278532f1562e3c5f SHA-1: d2172a84969dd663a3ed8532994d77f24b27604f SHA-256: 7376a6a37a0023d53ca09afeabe49070df3870ab26d7f4daf4b63d977ed3b3f7
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'maypoin.ru', suggesting it may be used to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=install+aptoide+on+firestick+using+er PDF link annotation
    • https://cdn.sqhk.co/gesimefav/Zo3YzKJ/27318916647.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/e7jihfl/54075652301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fe2d8a7f365a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_603e4aa9e3582.pdfIn PDF document text
    • https://cdn.sqhk.co/wemukubiv/jcYiegh/7779891786.pdfIn PDF document text
    • http://zamividiwido.22web.org/avengers_birthday_invitations_templates_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_039ac620982d4c7ba883146f25622904.pdf?index=trueIn PDF document text
    • http://joluvuworizuv.rf.gd/sprinkler_irrigation_design_example.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_3459450ced1d4cdc81ca2738a9feb87c.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4d2413f9e64f4729ae387d5028671c0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/double_dare_trivia_questions_and_answers.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_2b2704f782a04df7b0ef52bda9a0b8ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/adobe_acrobat_support_s.pdfIn PDF document text
    • http://wapofele.epizy.com/63702939858.pdfIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_a2bcbd66257740858e2ce8a9b1b8d9d3.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_c07833fe4d4549fd98f18fd5be192dd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/55763476722.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_6e361c0554644406a218e8ebb764da68.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 13260 bytes
SHA-256: ca3fd57bcff6acbfc7c87b7002cd263f48d54ad851775da43761fc5b84940526
font_01_sfnt_off0001594f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594F 5324 bytes
SHA-256: 963c5d6bec90642f97236b49ce338c6d1252e76eb3ca56d302ad16e937437556
font_02_sfnt_off00016b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B81 13520 bytes
SHA-256: 3fc925976d806a6bd422d852d2f7e694bbc8cc19d707cdccf7cc082da485d001
font_03_sfnt_off00019775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19775 16176 bytes
SHA-256: 8fc159efe18f731f8bb6b4cde73060df575f9497a8f226617ce7db122cffee85