Malicious PDF — malware analysis report

Static analysis result for SHA-256 723fa976a2f3703e…

MALICIOUS

PDF

83.0 KB Created: 2021-04-20 05:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2f921fd358f5ff785aec4d9c3f3074 SHA-1: f624c420fb73574d8165be97b81464a9c61833b5 SHA-256: 723fa976a2f3703eda0391528674197b2aea14c9112326890fb0a6732ebd720f
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', suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The embedded URLs, such as 'https://xajibur.ru/strik?utm_term=how+to+learn+english+writing+for+beginners', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=how+to+learn+english+writing+for+beginners
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/senuwopijawo.pdf
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/9987904.pdf
    • https://wivopugigevu.weebly.com/uploads/1/3/4/5/134514529/kaserebi.pdf
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/76defdcff5617e.pdf
    • https://cdn-cms.f-static.net/uploads/4375077/normal_60261eaf48af4.pdf
    • https://cdn-cms.f-static.net/uploads/4391605/normal_602817a457057.pdf
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/9607b6.pdf
    • https://cdn-cms.f-static.net/uploads/4484169/normal_6061c271c6dcc.pdf
    • http://laluwaraselolar.mywebcommunity.org/85399116208.pdf
    • https://cdn-cms.f-static.net/uploads/4412895/normal_601091c1acd53.pdf
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/2258734.pdf
    • http://taforojujutusig.mygamesonline.org/adjoint_algorithmic_differentiation.pdf
    • http://wulutano.mywebcommunity.org/mexavarufijofebiviki.pdf
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fd1353dc96d4.pdf
    • https://nopuderegitiber.weebly.com/uploads/1/3/0/7/130775440/pakagadeluvujas.pdf
    • http://vuvimivusu.22web.org/bible_old_testament_bangla_download.pdf
    • http://sowoxapexemex.sportsontheweb.net/model_airplane_news_magazine.pdf
    • http://juxumigine.mypressonline.com/56252504836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refepow.epizy.com/tenufepijuluwaxuvokabof.pdf
    • http://zotuxegusam.epizy.com/jubobobasuzip.pdf
    • https://s3.amazonaws.com/pafexegud/cycleops_trainer_instructions.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/mixed_service_costs_examples.pdf
    • https://s3.amazonaws.com/forupokisip/rutisala.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_off00010745.bin
f4f4209c7655236379f9dc52063b1020d19ef7f8b6aab3f164e924c7836e8486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 5220 bytes
font_01_sfnt_off00011914.bin
ec9083305fda62d34a9b7c8cf143c21c5c64a17118c549a280cb70c0de146918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10872 bytes

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