Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea6351b5379a3f2…

MALICIOUS

PDF

81.2 KB Created: 2021-03-07 02:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18f4adb71a680438fb0148e2da8209e7 SHA-1: 50e1c945290893c8ff83761ad175a77b36535aad SHA-256: 9ea6351b5379a3f2720a16c1d444f3a4c75b21c39ab21734cfa4df4283197604
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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://jumiwimov.ru/wix?keyword=excessive+obligation+in+relation+to+income PDF link annotation
    • http://gododerur.66ghz.com/harry_potter_6_sinhala_subtitles.pdfIn PDF document text
    • http://forezofulafenu.iblogger.org/fawop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedamodeges.epizy.com/91699646288.pdfIn PDF document text
    • http://bunebuka.rf.gd/where_is_the_thermal_fuse_on_a_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e9eda0-d492-4e0e-a7e6-84d7f9585438/91843148644.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_b17f4bcd1bd94553a95b5e9efdc9f843.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/telifive.pdfIn PDF document text
    • http://nokarox.rf.gd/easy_to_learn_english_grammar_rules.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_4a16893627514115bba117a44b153f5a.pdf?index=trueIn PDF document text
    • http://xinugut.epizy.com/giant_hogweed_identification_guide.pdfIn PDF document text
    • http://wigeriwo.rf.gd/lugikowafasalo.pdfIn PDF document text
    • http://vetodegadema.rf.gd/13798433253.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_7c567e9f5a0945e0aa0438739183175a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81153f81-ef47-43cd-9a74-5ef93a868abc/60635097723.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/dynamic_stylesheet_react_native.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_a852a1b1ee8b4537b04280887c02f8ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7295bb-c455-4ec8-a966-844e1131f998/bissell_proheat_clearview_12_amps_manual.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_5702bfb37a874e23a6208a3bd6c2bf98.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5344 bytes
SHA-256: 1d00028a5858423f4fa5842331f3dd9544fdfdc43a6bcc715fffd560777e7dda
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10380 bytes
SHA-256: 1802f01400da4f14baf74431894d970130ae43a9bd9488089d8430d262bc676d
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16344 bytes
SHA-256: a3ce302eef08bb9c5fa769a04ae3a6bf247ef5bbbe12cbbde0714e08402d0017

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