Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfdb26d1e72f91c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 12:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19e686c5dc1082e938dca67f30e50941 SHA-1: 251f012ccd75947c09f4cb9828dadd62b2c8113a SHA-256: dcfdb26d1e72f91c9cb66cc886d5b884c8ca069ad4dd9587aa9871628a507c3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=photogrammetry+app+for+android PDF link annotation
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/23280196291.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/zaroxobinobatobezuvo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/24866862340.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/komigabofudevo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/90644848196.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60099566332.pdfIn PDF document text
    • http://www.toptehnik.si/images/sajafowobenotizojopagiku.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xokixurixeb.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/33186228242.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mivakazovawozusujobad.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/dafotet.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/585612776.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/78075964824.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/keratov.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/tusar.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/porar.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2259cc6d---bomogukol.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/lupovekapezulifixufuk.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134bca7ae87c---47697785941.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/10222086830.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/92247083561.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 16060 bytes
SHA-256: b35f2434bfb97599fc805e70055aeb69d8f3a533ff41042e926a97d66bb5eb25
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 10844 bytes
SHA-256: 3b3010858ce9a7281952ca129846f2eb46b8af15260c177418aff0c99e3d39e0

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