Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ad9d2fd2740ba1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 12:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d4d1e61c8d5dcbb06575f6fca86136b SHA-1: c2045160eabf8d9a23d6eb611aa0f4be123398ff SHA-256: 26ad9d2fd2740ba1ac57db6762ff897c6cc48374f08ca22ac92ff7648b8c7a95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to suspicious domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ceramicasvillaflor.cl/UserFiles/File/xejatigaxuketalaba.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kijufekowesozilunevadojo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1471030e6---10096681483.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/gadakazematixixokarezebaj.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/72125092671.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/lalorivizuzimeziwidopore.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/48842544257.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/meluvenalov.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/fazube.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/bonaloselimalusuno.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vukuviduke.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/35294757546.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/79758242179.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/suxajewin.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/23243047965.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/58974890819.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/74694548438.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/10210822675.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dotumegi.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/rigabotoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+apps+make+money+without+adsPDF link annotation
    • 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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 10896 bytes
SHA-256: d1bdce926942e802055e93bf3db2ceb6cfd6837f91733cab1e204796dc7afac0
font_02_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16848 bytes
SHA-256: 2665b778d6b0d3590d68c87585072e6163898732bfb5a52d35715a72676c1cfd

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