Malicious PDF — malware analysis report

Static analysis result for SHA-256 a481b0d480fe1162…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8a44bf4bed8733369fb579f83897137 SHA-1: 8b1ae1aaee83712148275229684823aa57fcc6eb SHA-256: a481b0d480fe1162a3c53317de37ba4bc96ca9c8d9a32771e4ba3dd12e3b0ae0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into visiting malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mehreganimaging.com/images/upload/files/dubufeno.pdf In PDF document text
    • http://ogledalata.bg/uploads/pages/files/jitetigufelupog.pdfIn PDF document text
    • http://chinalabware.es/d/files/45044705645.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tifalifonifagenefa.pdfIn PDF document text
    • https://cristalensi.com/public/File/dogulifatefo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/gopesegaximewarudike.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/44544558355.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/poxuvetowep.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/30081125315.pdfIn PDF document text
    • http://groupkaishan.com/d/files/88040836488.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/83185051721.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77173949479.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wojozujogepekiwab.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fijosumivanivur.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/13000124302.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/44278990280.pdfIn PDF document text
    • https://businesslife.com/content/files/9223980879.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210906052218.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56cb6996f---wimokuvipiv.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kasowewumabusasapuwuwejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bluestacks+android+download+for+windows+7PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/69402018823.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 16760 bytes
SHA-256: 33f8ba191155369e535e8ecbc8eba6a6b24f2b1873922a170bd8aa7991e92371
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 10848 bytes
SHA-256: 3e342213cc69de7090692dbfccdb30af9b45828c8673dc2ba4feec86f054ecb8

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