Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e76a3491a145125…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 00:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1e42c93aff79ef3ba41f27fa647450 SHA-1: d4b90a64151803a7a85318dd3617e46d9143d2c0 SHA-256: 4e76a3491a145125950793a1b12bb4511cf656ba6e40c0ee97220634b07085da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one example being http://zobabikox.medianewsonline.com/dragon_age_origins_nightmare_mage_build.pdf. The embedded URL https://vilenefex.ru/123?utm_term=o+cedar+steam+mop+manual also suggests a potential phishing or malicious redirection attempt. While no scripts were explicitly extracted, the nature of the link farm and the malware detection suggest the document is designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=o+cedar+steam+mop+manual
    • http://zobabikox.medianewsonline.com/dragon_age_origins_nightmare_mage_build.pdf
    • https://cdn.sqhk.co/diridenafa/ZzjfyFS/gebotonupasijudoduwove.pdf
    • https://cdn.sqhk.co/tirinakiweda/hchezhb/disaster_recovery_plan_template_azure.pdf
    • http://koxelovanalimu.getenjoyment.net/how_much_is_a_55_inch_tv_at_walmart.pdf
    • https://cdn.sqhk.co/potasuregoz/giijjjn/heavenly_hero_the_great_warrior.pdf
    • http://foselosen.sportsontheweb.net/why_my_car_subwoofer_is_not_working.pdf
    • https://cdn.sqhk.co/peruvereraba/XH5idqN/teachers_assistant_resume_sample.pdf
    • https://cdn.sqhk.co/jemajujo/hajh7jd/xepabafirezumojalewule.pdf
    • http://lapitubemexidi.mywebcommunity.org/56723549143.pdf
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/piwanexote.pdf
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/kafuwalanakowi.pdf
    • http://gejokakop.mygamesonline.org/brain_teasers_worksheets_for_adults.pdf
    • https://baduzasozem.weebly.com/uploads/1/3/1/4/131407439/4074478.pdf
    • http://nenegifivujaxu.mypressonline.com/acute_leukemia_treatment.pdf
    • http://bisapusid.mypressonline.com/5436811052.pdf
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/jotixunososaverugifi.pdf
    • https://cdn.sqhk.co/savageven/hkVhjcD/27339880807.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nowimirozox.atwebpages.com/lijegi.pdf
    • https://uploads.strikinglycdn.com/files/25f6c247-891a-433c-8f1c-1785c17f8426/58933740536.pdf
    • https://uploads.strikinglycdn.com/files/e62a223c-6c78-4f4e-b127-564a8eb838ee/how_to_achieve_your_goals_in_life_speech.pdf
    • https://uploads.strikinglycdn.com/files/254e6aa2-e6bf-4e46-8453-04ebdfb58263/ley_de_condominios_estado_de_mexico_2020.pdf
    • https://uploads.strikinglycdn.com/files/07f710e2-29c9-49bf-9e71-c08e70d94a32/ingenuity_inlighten_cradling_swing_walmart.pdf
    • 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_off0000f1db.bin
a0a88f60092797e85674d1383f967a1449b14c9f89604af7cc17b16ef1299e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 5248 bytes
font_01_sfnt_off00010398.bin
40b4d93e1708f3dbd026c0d179764e155639ac4270c97d86a7ebfa88e7fbb106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10668 bytes

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