Malicious PDF — malware analysis report

Static analysis result for SHA-256 670d8e3e41fda6bb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 05:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af4919ab9cbec889f69a30cf09b906fa SHA-1: 0db7a13a7034e4496200fcf7b68ca88f62f6d90c SHA-256: 670d8e3e41fda6bb0d4cb01ee1d0bebf25678e7cd976d6db2e85fd496a4317ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+get+live+net+tv+on+firestick PDF link annotation
    • http://doorsatyrau.com/ckfinder/userfiles/files/97252419727.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412d5e4ad99---16460055421.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/popetebu.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vugilisorupuvalug.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wotikidatexuwoxevulatax.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/66336193913.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tozazuxofofuta.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/10487124316.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fokizujorugadinaxiluraku.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vivaw.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/30004761577.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/pafudedubuvegimiker.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/felirarotagumubiwuwage.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/76131930939.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/bajikumozavofojiregino.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/9257403017.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vimukomumatizow.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908205303.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/burewarigoroniti.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fc4c3026---pupavovar.pdfIn PDF document text
    • http://zae.me/datafiles/file/86461786104.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xotajegasawim.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_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 10584 bytes
SHA-256: 6fc5c94eafee27b8f90d6b7d8188f92ff3210dcc1cebb9c435809e579af05409
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 17700 bytes
SHA-256: 551a6bf0f1237fa7a093c3ea21f9288d8d60d710984998f43993d760e6d695be

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