Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73d0dfd152ca40a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 19:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8064562f2c68986c85bfb27b8bcaf44 SHA-1: 2b709cd25facd6333b4a003cf030290dfe968214 SHA-256: a73d0dfd152ca40a1cbde85117bd88bc206c3a06d8dcb14b399ac07ebc3d7210
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=download+filme+subtitrate+in+romana+pentru+android PDF link annotation
    • https://securitydm.com/slicice/file/30636368638.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kurafexasefipuwiveguw.pdfIn PDF document text
    • https://chptravel.ir/data/file/xaviwivufel.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/42768741570.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/79070931494.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/56471942992.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/68995423019.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/xudigosuliwuramijod.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/78835267640.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/25248592764.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/29755603010.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/22086642426.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/wamuvobox.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/vufilufudetedam.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xekulevakudu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/tizakutumugokivekalosilu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_B79E3A9B8DD2D139.pdfIn PDF document text
    • https://renault-service.com/userfiles/83889710123.pdfIn PDF document text
    • http://vejwun.cz/images/guvokokoj.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109111418482628.pdfIn PDF document text
    • https://hirurgija.me/files/jivolir.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/wevajunixavodut.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/rubuxezekegeritajage.pdfIn PDF document text
    • https://songhong.info/userfiles/file/59225226425.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 17188 bytes
SHA-256: 141d587913ba53115f734fbffa55ec9b95b11e8461e4ed396981a64a55703fe4
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10984 bytes
SHA-256: e554573fb016eea2a3222ed202d0b76e79d38d36401e4d2d7788be401e682fb8

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