Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8008bac0315bf8…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 08:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b924383b3865b6fabfbb6a324e71d6 SHA-1: 511fe174305cfd4c0c6d7001b23212f921650889 SHA-256: 5e8008bac0315bf8f1225e2b4651260ba0eebb0ad8105115e87aacb11f62882e
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, many of which are hosted on domains commonly associated with phishing or malicious content farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to printer troubleshooting to entice users to click on these links.

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-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/strik?utm_term=how+do+you+troubleshoot+a+zebra+printer
    • https://cdn-cms.f-static.net/uploads/4383791/normal_601dbde384d8b.pdf
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/f1d175760611c.pdf
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6012c864730e7.pdf
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/xatoruzanikoba-kibek.pdf
    • https://cdn-cms.f-static.net/uploads/4377371/normal_604c9db425860.pdf
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/5475287.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_6055942290851.pdf
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/jugigoxanone-punurimob-vemokusaw-kewunon.pdf
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/munopilifi_fuzalinex_rowuxesewepela_zarejox.pdf
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/refugadafoxep.pdf
    • https://difegalit.weebly.com/uploads/1/3/2/6/132681294/finomenogejud_koguxogo_tamiloxumufemop.pdf
    • https://gopojobazisedi.weebly.com/uploads/1/3/1/4/131436977/8559303.pdf
    • https://cdn-cms.f-static.net/uploads/4416301/normal_600b241f1e0cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/verirejon/94417166385.pdf
    • https://s3.amazonaws.com/tesasubawalozan/shatta_wale_prophecy.pdf
    • https://s3.amazonaws.com/damerirazib/45039406890.pdf
    • https://s3.amazonaws.com/muxegeza/misironofumasowawazoreve.pdf
    • https://s3.amazonaws.com/jakujakula/19714954051.pdf
    • https://s3.amazonaws.com/suxiweke/10000_free_ebook_reader_app_for_android.pdf
    • https://s3.amazonaws.com/xuzakob/togogetilopupeze.pdf
    • https://s3.amazonaws.com/zeworibuzoza/aptis_speaking_test_sample_answer.pdf
    • https://s3.amazonaws.com/dudigonifu/898172444.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_off0000ec26.bin
d35a97fb55828da31f2577edf8c125bd16249fa2af0ffb6c34c62f7c1ba2df6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5392 bytes
font_01_sfnt_off0000fe87.bin
6161d0403cad9912685e4a200fa91ec223279bf2022f2bb04382659b2bb20d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 10288 bytes

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