Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ba8b39e5476a05…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 16:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12e5225b86214da8fad953dfebef03c0 SHA-1: 42498b679e04badb4bdd6809719078d07283486e SHA-256: f8ba8b39e5476a05b128ed01f93c9f2fda2c07e739f7fff2a02710768b55614e
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous embedded URLs pointing to PDF files hosted on various domains, characteristic of a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://drironcat.com/images/file/nefizivit.pdf
    • http://csc0516.com/userfiles/file/20210901111916_yi5gdo.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/tozamalawusixogo.pdf
    • http://dulichtantai.com/files/uploaded/files/84744341297.pdf
    • https://phu-komplex.pl/pliki/file/weborol.pdf
    • http://kovospm.cz/fotky/file/84169851710.pdf
    • http://ogledalata.bg/uploads/pages/files/karivimex.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9764214ccea28586cdbe735841df9cda/petamek.pdf
    • https://burgas-remonti.com/userfiles/file/sizovamisupumaberor.pdf
    • http://magic-mugs-factory.com/uploadfile/files/daxuvinu.pdf
    • http://support-cmu.com/filedata/file/38740432087.pdf
    • http://mfahk.com/upload/files/50712376681.pdf
    • https://akapacha.com/userfiles/file/mudemonusudirero.pdf
    • https://soudurelauziere.ca/upload/editor/file/53626978931.pdf
    • http://kfnmdg.com/upfolder/e/files/20210902112638.pdf
    • http://mskgroup-spb.ru/upload/file/47172472101.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fupopuronebozegeson.pdf
    • https://fajndoktor.cz/images/file/files/bekurekofivedavu.pdf
    • https://www.ruchya.com.tw/upload/files/17906631449.pdf
    • https://securitydm.eu/slicice/file/mojubekunuti.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/36652415390.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/72775917028.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=app+to+play+downloaded+music+on+android
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b710.bin
f2e023ab5fd692b50a0d62938c6bad521ddc2eae01f84966d89bc0da08296f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 10956 bytes
font_01_sfnt_off0000d092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 16792 bytes
font_02_sfnt_off0000e8a4.bin
12aed7a91821e9a01d524bd526b756b10132e2aeecb3ff2f9f4f7d09acdd38d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 16472 bytes

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