Malicious PDF — malware analysis report

Static analysis result for SHA-256 963f2dc16fa9ef90…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 17:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c58a12456a895b12ac5e9a961a3de16a SHA-1: fdfbcf0e20c620e29b76b9417be48f27a26f48a8 SHA-256: 963f2dc16fa9ef90226afb6c1b5dfbf9e806b973c4bc93b2cff9219a0ff12401
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers and delivering malicious content. It also features numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=types+of+graphs PDF link annotation
    • http://ingegneriarossi.it/userfiles/files/35446171550.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/regijejulu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/26679812023.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/danubetoz.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/44923349287.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/71099652528.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/desenarivarivufa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a8294c49b9285e0427a6f5d72a46fe7d/sawugawizu.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lafipuramul.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/71642980550.pdfIn PDF document text
    • http://receptlap.hu/files/wotovu.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/94444417531.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tamojamulebowudetuparefet.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nuwope.pdfIn PDF document text
    • http://ducnhua.com/upload/files/tifibamopejukususesike.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zegelujizekesitubop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/44384466673.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kelekamifewozirujiva.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fc0c753d3cdffd3f07d42ef206c2d32e/zaxelim.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72241253297.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/97995355643.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/geravovolabobejo.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24872183290.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/60941657414.pdfIn PDF document text
    • 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10372 bytes
SHA-256: b4877f29bc7d898e2b0ab2dc23851d6bfa58da9c0843b2483a0bc77a244864df
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 18568 bytes
SHA-256: 92861ebe89879fd0ae46397c7fc0c7ec99520618f9b7699568080aef7b7580b0