Malicious PDF — malware analysis report

Static analysis result for SHA-256 825813ebfcc4d410…

MALICIOUS

PDF

118.7 KB Created: 2021-09-11 01:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0b393bf8666426ffb3776fc55566da0 SHA-1: 7e552669305472b5cbd3803d4f37cfdceea59583 SHA-256: 825813ebfcc4d410879ae4c9ca0b70ed6126465ddd87246747b23ea231ee3dfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=las+cien+preguntas+del+aprendiz+mas%C3%B3n+pdf PDF link annotation
    • http://espacioschillout.es/images/admin/file/darowokibatimilibi.pdfIn PDF document text
    • https://ivanamihic.com/files/61166176065.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/51901234672.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zivilujom.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/pigomajanuwezitubebij.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sitezen.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134516cee8ee---5938771207.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/40125933533.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/wofijolalapeje.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32390123256.pdfIn PDF document text
    • https://securitydm.com/slicice/file/manixuvabuf.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/pawukipotasogutopusurusur.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/lipapon.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/biridotidemexerax.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dca9a1f---wudarutifebarufupo.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/19231878103.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/xajamisaxogakolevud.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/mevakowunulazojutupo.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/mokalewevun.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/62685129558.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/nerurizof.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/zuwotipupatuner.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/23993681555.pdfIn PDF document text
    • http://orem.mn/uploads/files/70757838101.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_off000165d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D9 19692 bytes
SHA-256: f8bc5f1aaba29af3cbfb6f391a0153ad30a1275dc9eabf2da3a0cb991ac06319
font_01_sfnt_off00019878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19878 11100 bytes
SHA-256: 69006e4a21b06816147045446f716dc24160cffa29aa02151cafc99211d10984
font_02_sfnt_off0001b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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