Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f396dc7210a830a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 04:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e837df7aa7c726df332789fab5f0a8e4 SHA-1: a1398b085bde18b5d4f2a26bf970df0463cc3169 SHA-256: 6f396dc7210a830a75df68d422def45363766c7e8c8a8829815d136324c278aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a high number of embedded links pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=dokkan+battle+global+apk PDF link annotation
    • https://vietrocknet.org/app/webroot/img/files/jibeledosepe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/54431112079.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/depetemugawerasuve.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/96258100209.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/16747647993.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134437a4eb80---78464894467.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/84233859080.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/17716724716.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/moripolofonozesi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/pivat.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/1456646834.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/debasosotawarupenikeri.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43340805084.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/negakag.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lonavamuwixaximazom.pdfIn PDF document text
    • http://esejsc.com/upload/files/71198999409.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/77584112603.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/35900259376.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49281069035.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gadusekupilepoxijim.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/pivosoma.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/wamofolanawukedap.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/jenelejodulezeki.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 18160 bytes
SHA-256: 423d75b2945e7e19ab0e64b5100a779eb19fe02e4395bda7cf01d1c02c4f5bff
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10300 bytes
SHA-256: 8fef338d5cbeab150e3739b9a73a868c33b12cd0d3d4ca941b83fed26e0db6d9

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