Malicious PDF — malware analysis report

Static analysis result for SHA-256 77599f9424198096…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 16:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9fb0a8ca7770fe730a97823b7f61f5 SHA-1: e047cadc334741c7d25fd3565268081003b59f6b SHA-256: 77599f942419809694ded9a6d41dea05ece92faa6c4d19680ff1b71e4b179ef6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to contain keywords related to search engine optimization, further supporting the lure of directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=eagle+pass+tx+high+school+football
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/ac2656.pdf
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/87d98ea3ac936.pdf
    • https://cdn-cms.f-static.net/uploads/4448347/normal_603891041baca.pdf
    • https://cdn-cms.f-static.net/uploads/4470412/normal_60369f04285ed.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/d5b5f12867520ad.pdf
    • https://cdn.sqhk.co/fironabe/a7jgr9L/kamoworakadidab.pdf
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fda2bdb782f3.pdf
    • https://cdn.sqhk.co/tororukiwuri/602jhih/knight_rider_kitt_car_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fe8545d7f7e9.pdf
    • https://cdn.sqhk.co/mubasetopagu/gKjiid8/fupujezawulugagiwuzug.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/vefegeso.pdf
    • https://cdn.sqhk.co/xarupozikala/ggSheji/wukodopogani.pdf
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/1357374.pdf
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fec94de18b10.pdf
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/2539058.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d003a08010a748dcb3f823a337e7b3a5.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2055b2b3160e461b8bd01ceacf6dd073.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e810.bin
c10713be693a24b6b969aade407b425c21267063523e64386ea4697aa759865b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5348 bytes
font_01_sfnt_off0000fa50.bin
9c106b89b306f9ba97ebfe1a414c44f6772680d203a2d190beecb3906442e957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 11044 bytes

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