Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7996d512b101524…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 10:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49a0c40199cbb46d925be6c764ddda55 SHA-1: eab4624a2cab0d5dbe8e498e0828254459240eb1 SHA-256: b7996d512b10152441f56ef38caa7ca3abaf5e64d18287f8f26d48c70dd386d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The document also includes numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=transfer+data+from+old+android+to+new PDF link annotation
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dapilupomuta.pdfIn PDF document text
    • http://yongqingtech.com/d/files/saximimosovuzikim.pdfIn PDF document text
    • https://equinox-e.com/upload/files/nepifunoroxobedi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/52156179446.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/39167848077.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f3477317---56716593906.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/74777960936.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/21194525668.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jonim.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/53414883152.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38412968507.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/4951309287.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/zinokixiwefitesutapefudo.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/85459150613.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kafexovesife.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54ec96c06---lamaxutulezuwifoweko.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/wazebekulovofumakidod.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/zexokebaji.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/11692674437.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/15752636060.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vamumogumidun.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_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 16912 bytes
SHA-256: e4b63d380bf178700aa44bda13699b099a981aaa7cd7fd52296bc4b9df1ebdb5
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 10564 bytes
SHA-256: 59914538f77a0a4a50f7ad6e1d62c6fa8ebbe1b4376d67086501f8872a943f1a