Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd7934e1f2e6074…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7a7c12ed1beedbf6b59313ed0cb63f6 SHA-1: 6d157808b597b8c73b69327da2cc6a7e3cf40cf4 SHA-256: 9cd7934e1f2e6074f3622998a1ce45556fd6e2ea6293af8b1b7eb82b6acd79eb
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=viva+video+windows+10
    • http://weiddy.com/uploads/files/202109251233266917.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/wexekijuwuvejupowapupisul.pdf
    • http://alphamarino.kz/images/news/file/milefekifuzewovofowutu.pdf
    • http://wonderful-foods.net/userfiles/file/niwejiwaka.pdf
    • https://bnovum.hu/downloads/xilavagufudidakoziketenak.pdf
    • https://thefencedocumentary.com/adminfiles/file/vefovewemosobosog.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/niwowemunikigizikaguxex.pdf
    • http://niezapominajkowo.eu/userfiles/file/xawibaluwa.pdf
    • http://goozzl.com/userfiles/files/negobixapisanugofafu.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e125fe7dca---96602761516.pdf
    • https://hoangphatdanang.com/uploads/image/files/45855815587.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/sotarutuvulikatotusodavej.pdf
    • http://tz5168.com/uploadfile/image/2021/09/06/file/20210906_042607_113.pdf
    • http://incomingmakedonia.com/files/files/8465469107.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/17155512200.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/zaxilivomabiwulefisesal.pdf
    • http://smenergy.kr/uploaded/file/196582420861309f278a686.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c45b9d2db---14794066251.pdf
    • http://xy-interior.com/uploads/files/202109221533311137.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/31922444798.pdf
    • http://rainternacional.com/userfiles/file/netexogerikejotifawafifal.pdf
    • http://vce34.ru/attachments/file/14908018048.pdf
    • http://kleinschaden.expert/userfiles/file/86559821758.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/66585387746.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/45141012304.pdf
    • http://keemunblacktea.cn/uploads/file/040146125835.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b755.bin
72dff1a31caea750c7ca9c16c39d9052c1a123ab9dd24b43b3e347a1abf08ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 10292 bytes
font_01_sfnt_off0000ceae.bin
cda2e4802f03423938c0c002fef68dd5b66e7c3ae139ea24065e263f96c0e8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 15988 bytes
font_02_sfnt_off0000f73c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 16792 bytes

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