Malicious PDF — malware analysis report

Static analysis result for SHA-256 6727959339fd1ab7…

MALICIOUS

PDF

112.7 KB Created: 2021-04-04 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de8a3bb2635ab48e645d666421154fa6 SHA-1: be990f3a39a0275f9a0d28f2a35713712e804f44 SHA-256: 6727959339fd1ab771adef1926142aa522fdd29b09fe57f95a89a61b01000ca9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://dugedepap.ru/award?keyword=major+depression+dsm+5+pdf PDF link annotation
    • http://gagarinski.su/fanatisubejevuwufunemufmuqc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_6062ebdce1a2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368731/normal_5fe1911d3ace2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_6027dcdfae6a8.pdfIn PDF document text
    • http://kawlites.online/505027568249hx32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_512c548bec4b4f9d8117866aaefa5dcf.pdf?index=trueIn PDF document text
    • http://jasetaroxakil.rf.gd/jilojogoxetulug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ea255b-41de-4d43-aba0-a425bf955bfa/electricity_and_magnetism_2_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b55efd-19b6-45c6-ae20-8c1c52101c7a/how_to_run_visual_basic_program_from_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe18b27c-cb26-441e-837e-09f43bd08e61/reset_sonicwall_tz_205_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41725a42-9b37-4cd2-b3aa-bc0bbb8dfe98/fce_reading_comprehension_practice_tests.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/wefoferup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddcc10c-e633-4d7c-9fce-b03313f742b7/pobre_ana_chapter_6_summary_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c070a0eb-2490-42d2-a5e4-186346fd754b/gaguzosuwisadirekom.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_b4797c0243524c698130f10f578470ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/728ef74a-2a67-432f-9528-09d62a355a44/rotanes.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_a9093f8913bd4fde82cb81eaee4f7de8.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_off0001797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797A 5360 bytes
SHA-256: f02784654c8a7dc4ba2f2e8262df74cf01e304196f8d3c8fb92bd186b0256d0d
font_01_sfnt_off00018bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB5 12960 bytes
SHA-256: 88ee8d4675ffb0a8e47b4d9037b1e6377b22e635fcd4dc880ec7d36e3e7020e3

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