Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a324e3f5593e4e7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 14:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2041c061145c93d73ae5f3a234814157 SHA-1: bbafd870550f976dfbaa36ca417337d6d5473bcf SHA-256: 5a324e3f5593e4e7c95e1854f6d4ac2c03a915f63b4d4d48756a239ba8374fe9
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document employs a social-engineering lure to trick users into installing a browser extension or update, a common method for delivering malware or stealing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://houstoncoinclub.org/FCKeditor/file/40483919111.pdf In PDF document text
    • https://poker-fire.de/file/63741255472.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/72737559417.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/62088413625.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/menafozax.pdfIn PDF document text
    • http://dd-eng.com/files/files/fadep.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161352c87e7ff3---48115764574.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613762cb7580c---85781344674.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/resapejobivetekimu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/6532946616.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/89607226249.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/21887357815.pdfIn PDF document text
    • http://normel.org/files/upload/file/23267439151.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/voluwigonenuforuwokupid.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/mubetapegenuzig.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/jakisaxoge.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/97232808186.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210902_090556.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/1540694040.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/rokenedebifanoloxa.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/jetaju.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/61244570295.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/95979721778.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/23584307486.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gaguzalalekoguk.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/78160048906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+i+transfer+data+from+android+to+iphonePDF 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_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10748 bytes
SHA-256: 04d51c5f6df54d4001e1d2933a3872cbe04801b8182bb065abc76dc7261a164a
font_02_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 17644 bytes
SHA-256: 020d2abfd5d42495465fedebf8c6aa1a379678fec341e8c281e2f64bd9a13120

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