Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda235f5f00fd799…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 04:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a525a7a2dd5d1496a2ba9203a7d486 SHA-1: 5054b96c90f572bd0b643014652d8b38f1af538c SHA-256: eda235f5f00fd79981c598e8e9b5401361b678bdd061ef799de502e0d0463206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=modelo+de+memorandum+para+trabajadores
    • https://cdn.sqhk.co/wavagowew/QoIuVgj/88945531069.pdf
    • http://persequen.com/white_rodgers_1e78-151_resetly2lg.pdf
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/dovegoroseriku-bonudasi-kifokimi-jixobenozate.pdf
    • http://animoney.xyz/vehicle_tax_reminder_v11_formdii0b.pdf
    • http://moitender.org/lizibunotaju0wv2c.pdf
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/3600291.pdf
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/4392975.pdf
    • http://idealica-ituficiale.website/samsung_bypass_activationbe4jq.pdf
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/zadomuzorubelinux.pdf
    • http://geesecam.com/my_rotten_redheaded_older_brother_personal_narrativebjb92.pdf
    • https://cdn.sqhk.co/fudamewojaf/ibusnjc/maze_runner_4k_wallpaper.pdf
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/80a8b47aa6ad60.pdf
    • http://123dutch.com/tipos_de_sistemas_de_comunicacion_informaticaeavt5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://girofili.myartsonline.com/demewon.pdf
    • http://vawirir.atwebpages.com/jofodokafaridosunipebox.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79b.bin
10d10519bb9b44089800bc327e6106dbebff030c6a3afee276477d21c042a0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 5160 bytes
font_01_sfnt_off0000e909.bin
aec530a55780f8c968e4ccee55ff4b332d6ba126fc31e0f0b02292a94f610d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 11756 bytes
font_02_sfnt_off00010f4d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 4324 bytes