Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9857c70ce2d783…

MALICIOUS

PDF

83.0 KB Created: 2021-09-28 18:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1844c170f003f636256bb009c17bafb3 SHA-1: c49c836a68328f6700acdb87c416819d262184f2 SHA-256: da9857c70ce2d783a2a69116bfb42a6959d84d719ed9acfd0d9b974389650664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to host a large number of external URLs. The PDF contains numerous embedded links pointing to disposable domains, strongly suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of many external links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=process+com+sec+android+app+myfiles
    • https://kenkochaya.com/user_data/ckfinder/files/lumajedenawexemefurudaf.pdf
    • http://costruzionibulagna.it/userfiles/files/4763002180.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/kolufovuzekesexi.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/31119500307.pdf
    • http://foodchemsino.com/d/files/47671893551.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/kedonukajexefunom.pdf
    • https://havadisname.com/upload/ckfinder/files/mitomovejamiloriluxigar.pdf
    • http://openendrep.com/userfiles/files/97066509077.pdf
    • http://mediedil.eu/userfiles/files/tuxakasifesojixakov.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/lowobupoxavubasubemugafi.pdf
    • http://claudiamelchior.it/images/file/91039993550.pdf
    • http://aven.su/userfiles/file/98577898918.pdf
    • http://royalgroup.at/tmp/53728606292.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/sidazamubat.pdf
    • https://kcss.hu/korosi/userfiles/file/15397536804.pdf
    • http://stoewebdesign.no/userfiles/file/45282709747.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/rulijejedilutema.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/xoweduxanid.pdf
    • http://hzzxtl.com/UploadFile/file/20210907121232430.pdf
    • http://fujiya-la.com/uploads/files/30250370752.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16792 bytes
font_01_sfnt_off0000d929.bin
d5e5a94525cb617ddc9c50e614536201c3c95ff8446634cdb70d98d519b25e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 20476 bytes
font_02_sfnt_off00010f15.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16232 bytes
font_03_sfnt_off000124ef.bin
f4ee2914a18b095378365171c56b87616fda6dad7223e0fa17c1ec86cfacbf37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10796 bytes

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