Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec444f31884d4db…

MALICIOUS

PDF

80.3 KB Created: 2021-06-04 09:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bdbcf8a700a7121c0034d049a85ab35 SHA-1: 416d02ffb460a08bfd3742803b3817f5c4e36315 SHA-256: 4ec444f31884d4db49b2eaa711812291422a7519c9632d08dbd3fba920bf9ad3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to Android 10 and Redmi Note 8 Pro, likely to drive traffic to the linked URLs. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/pbw?utm_term=android+10+for+redmi+note+8+pro+release+date+in+india
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5ffed05d03211.pdf
    • https://tusozokusex.weebly.com/uploads/1/3/4/6/134678333/9082490.pdf
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/sodavunix.pdf
    • https://lomagifotoji.weebly.com/uploads/1/3/0/8/130814873/b51a1ca.pdf
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/1336779.pdf
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/dcfbc6eb.pdf
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5ff3382f8121f.pdf
    • https://static.s123-cdn-static.com/uploads/4501198/normal_5ffececfca60d.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_6012d8d7a1c47.pdf
    • https://kuvixutag.weebly.com/uploads/1/3/4/3/134347355/9917281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bc7b87a1-57c9-417b-9732-77e8a8adfcb8/regumov.pdf
    • http://supijexed.pbworks.com/w/file/fetch/144585981/ielts_general_writing_task_1_book.pdf
    • https://uploads.strikinglycdn.com/files/f9f97d08-c352-4322-a0fe-4191e42d52a2/velinubifodupelimupiwus.pdf
    • https://uploads.strikinglycdn.com/files/73169ce8-cab4-423a-8ea3-462247c392fc/mass_effect_2_game_guide.pdf
    • http://beratirupo.pbworks.com/w/file/fetch/144602502/how_to_wash_mattress_protector.pdf
    • https://uploads.strikinglycdn.com/files/188cc95c-ea95-4149-99e7-a2e94ef02135/what_iced_coffee_should_i_get_at_dunkin_donuts.pdf
    • http://vimadutukad.pbworks.com/f/cheat_dragon_city_gems_without_survey.pdf
    • https://uploads.strikinglycdn.com/files/9de70e75-6cf5-4414-a916-17427fcdf6e7/how_to_write_a_good_college_application_essay_about_yourself.pdf
    • https://uploads.strikinglycdn.com/files/ca38af38-173e-4409-bd19-3a7e13499d08/21537209171.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005b.bin
8716de34ce6e3aa42c4126ab3fa26b8569b0d526ea0557955afc289657547d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 5564 bytes
font_01_sfnt_off00011338.bin
d96cb187e233bd319be0330950fb0fb65826c379be0b6134737088df69f07a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 12304 bytes

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