Malicious PDF — malware analysis report

Static analysis result for SHA-256 4097eef0613f70ab…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 22:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6df4c2de19422eed9e01209221a2f8bf SHA-1: a324353315c5bce20ea92d51de92312470160999 SHA-256: 4097eef0613f70abeef78ad654f917e12a88657d26cccbd013e762879c90bccc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution vector.

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 http://finchamauto.com/pics/wenezivepimevitulax.pdf In PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/towigitogexaxiguwu.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/71655737842.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/36722195519.pdfIn PDF document text
    • https://ambalatender.com/upload/files/60270400713.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9e16e14a---lalokaranesudo.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/finefux.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/26631348510.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/redivumixeraxuwemop.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/danebugomonerapituropef.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jinomebejanapigopu.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/84513198746.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rosesitejexopebikadodo.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/92355127532.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/91842126427.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pereluwepubapufededelim.pdfIn PDF document text
    • https://haidangpc.com/contents/files/baguwisod.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/sajezavonexodonulefupotag.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/demoporaletedojizoke.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/86855520184.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19881321360.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/pexoxomopudifunonelelo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/59125322713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+recover+data+from+a+dead+phonePDF 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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10892 bytes
SHA-256: d0ca7a73e241951fa5c3851daa3b7fd418b70a24a03f486cf34c813d1d50b45d
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 18528 bytes
SHA-256: 9df8d153c217b10453f2e29c7b78f54274fa2b9531170c0d6fb9bde4e6ad01c0