Malicious PDF — malware analysis report

Static analysis result for SHA-256 12963b46ea0ae7c9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81275b3ad2cf81aee96ed6248d790c24 SHA-1: 665b52d46f73dc1169969980d99b3a280c69cc96 SHA-256: 12963b46ea0ae7c97fe8cc3339c356baef635f361d9f852317cd466144c49ca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous links to unknown PDF files. This suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16149d97191be0---7154418826.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/xevelul.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/77933260007.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/99653847757.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/levivaf.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/451ac9bb7aecdf4f7dc7b09e5c46ca86/24522085146.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gimogejipegosufumi.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/23094878671.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/pelutazurix.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68234094156.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/28610053989.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/wetemodazuxolodesofoku.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/62659706838.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/pugiko.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/fatakaberod.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/72566833524.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219148129385.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/vigizatuxamajewi.pdfIn PDF document text
    • http://one9five.com/userfiles/files/36811066043.pdfIn PDF document text
    • http://all-premium.com/user_file/files/tinasidekekutu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/55493502917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shahezad+kazi+general+knowledge+book+2020+pdf+downloadPDF 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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 17876 bytes
SHA-256: 0e0fe08fa73492be15170563bdee01b3a7e24109a150a9bc1949dac8de5b3441
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 11204 bytes
SHA-256: 186d4caeba4f905bdff261a40bf4ba6c6ac9eb4e8545785c86adf4d9a75c5c2b

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