Malicious PDF — malware analysis report

Static analysis result for SHA-256 defbf98f3c4fb0f8…

MALICIOUS

PDF

92.5 KB Created: 2021-05-24 05:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c06d93ac830bd5f45a09afacf66edc5a SHA-1: 5fc82fa0e9c2a8d42879aac0b42685d7d658d90d SHA-256: defbf98f3c4fb0f8027e52649da6fabcad73123ea8d6e4ad0214759887f39abc
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The primary malicious URL identified is zajinet.ru, which is likely used to host a phishing page or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://zajinet.ru/strik?utm_term=d%2527mand+kontrol+s3-100+manual PDF link annotation
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/3069235.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/5580458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_600659173d154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_602d5974d7ad7.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/059104e82636.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/931fa8.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/0a04f21bef3b0.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/411a4769b4e5801.pdfIn PDF document text
    • https://wuliwedifa.weebly.com/uploads/1/3/4/7/134753749/708835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gopuze/25448625088.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/palmolive_dish_soap_msds_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/jeradepisisu.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/moluweburonunopidalori.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/64291929845.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/lagu_deen_assalam_adella_arlida_putri.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/limpopo_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/fapikoxusavajibedorew.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/roomba_780_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/nothing_else_matters_tab_solo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 5172 bytes
SHA-256: b076fe6f575eccd73f31981ceeb812a0f23fde9773e35fcaa05034387653376b
font_01_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 11584 bytes
SHA-256: 67b913ed8cf8c2f4d121c5606e07facbd87a4d33b1b8954cc8da9b33a7895740
font_02_sfnt_off000156a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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