Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54dd726249ae5ca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 11:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a9de02ff0d72cc41d31d224d12ce35e SHA-1: 87953b4110cf96c6ef1714ae11360ad3b482ebf2 SHA-256: f54dd726249ae5cac16bd34c163a3084cc52f8150a71bfb25e0e85b12889db49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of a visual download button and numerous links to external PDF files suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hilanguage-com-tw.triangle-design.com/files/2245839966.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/48bc6e71c7f95838c15cfe31e29a2628/kibixura.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/97213064810.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/62527783881.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75888825602.pdfIn PDF document text
    • http://congluc.com/upload/files/12087516696.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/tuzubolarilomaxatulufe.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vasubefaz.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fasekuduxizumujerewifole.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/rurep.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/6334227540.pdfIn PDF document text
    • http://full814.com/upload/files/kefol.pdfIn PDF document text
    • https://termofriz.rs/files/23578835758.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/76908044461.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/pozogisepokokax.pdfIn PDF document text
    • http://recrute.fr/files/files/luzajorim.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/67551116683.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xasegozogedurigiwowuj.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/95340163541.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/wezufatajazo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/97033994793.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee86c1edd0---zojule.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/61018676879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+engine+apk+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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 19104 bytes
SHA-256: 86d70627ed9dc3e8ae812040f60cf62e791ded56b71da38bc04a952690b9d694
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10612 bytes
SHA-256: 14929bd821f6e98c4eb84add7dc7629b197f93cfe9ef253728c461a817224b98
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1