Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c01099f3d8a70a…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 07:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7f23ee7303464ccb3b7341223f22de SHA-1: 7bf92c13fad6451b88efcd1d99dcf3c41e852351 SHA-256: 84c01099f3d8a70a3068e4122aeeda7fe838bc2c12f9d165374aa04bade56865
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to domains that appear to be part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'practice exercises'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=section+11.3+acceleration+practice+exercises+answers
    • http://xudogiborijum.66ghz.com/turbo_manager_app_for_android.pdf
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/6e5c853afe7574.pdf
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/50a0d9.pdf
    • http://makilevemifaw.iblogger.org/97529516713.pdf
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/kewunudenemebeb.pdf
    • http://fezanabuxa.22web.org/wood_cutting_machine_video.pdf
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/febazuto-dadunuruxono-lixizijanubifol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tubusivi.rf.gd/change_management_ppt.pdf
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_a04b820fb7974f20ab1309e6865d474c.pdf?index=true
    • http://jilawovo.epizy.com/69371390269.pdf
    • http://koxusaje.epizy.com/third_conditional_lesson.pdf
    • http://zumewozuzetarun.epizy.com/21581661751.pdf
    • http://purevaxa.epizy.com/free_vector_logo_in_corel_draw.pdf
    • http://migebepumeneba.rf.gd/miweporuvo.pdf
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_c660854289e245e4bb20533b3d4fc6e8.pdf?index=true
    • http://fupofew.epizy.com/bose_quietcomfort_25_instruction_manual.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7de8343f927a44df8d29455db43b6246.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ad998b27-e238-44fd-bdd3-bc78f955ee48/64367695420.pdf
    • https://uploads.strikinglycdn.com/files/d9f3c78f-fc52-40ca-83c8-7114c7985535/13855182963.pdf
    • http://japivolenalu.epizy.com/mixeganuzozurotaxu.pdf
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_3eec46a7a19a40ee9bd2762ec9de5b4e.pdf?index=true
    • http://wavujajelel.epizy.com/31056631463.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_off0000d965.bin
b9504f83e77a14e757075023c9ff79ce5b641e18fba70aa8e5a1209a9e86e984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 5436 bytes
font_01_sfnt_off0000ec14.bin
e2637d60c430b6632a333fdffde2d9ea53dc76492562d685eaf309447b699d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 10660 bytes

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