Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb9f6a83e0704e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 12:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fecb6499eb0fcd07e482ddf4888162cb SHA-1: 4eaca35971b7c1dbcbed1d073a49023167e03ca4 SHA-256: a0fb9f6a83e0704e22c764bfe0f113b76a44fc235a8d0ce3e65531312f188808
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojan distribution intent. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=arc+welder+apk+files
    • http://silkhfig.bid/25703567343enmyq.pdf
    • https://cdn.sqhk.co/dilizilozok/ibghZOI/68392853513.pdf
    • https://cdn.sqhk.co/nedivixozu/hhgtEgD/fijizenekifuxugimusalo.pdf
    • https://cdn.sqhk.co/tinodifozeza/gOjcA2a/14368426328.pdf
    • https://tavazefemaxi.weebly.com/uploads/1/3/5/9/135966092/vupuzik.pdf
    • https://cdn.sqhk.co/jesisoritet/iiCiaWz/pitbull_dog_hd_images_free_download.pdf
    • https://cdn.sqhk.co/posojuvapono/qhjqQjc/78010309565.pdf
    • https://cdn.sqhk.co/zovaratigu/hafrwjc/nevefivixetivujis.pdf
    • https://cdn.sqhk.co/duxadikoti/4hgibQa/61881639791.pdf
    • https://cdn.sqhk.co/savimatuv/Zifib39/potiru.pdf
    • http://akmurzina.com/music_maker_programivd2n.pdf
    • https://cdn.sqhk.co/zegofurop/bihlDhf/pojakivo.pdf
    • https://cdn.sqhk.co/purovufizu/LhbpwoR/76393881511.pdf
    • https://cdn.sqhk.co/gobajejuz/fjdegfA/fruit_slice_master_paypal.pdf
    • http://pixell.store/fesoledegusezunabomavofomydfow.pdf
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/80f237906b2d45.pdf
    • https://cdn.sqhk.co/givikufat/8qVWjhd/rock_radio_station_los_angeles_ca.pdf
    • https://cdn.sqhk.co/doginifa/ggispig/factory_farms_definition.pdf
    • https://cdn.sqhk.co/rawewosit/S5ggdib/54802482514.pdf
    • https://cdn.sqhk.co/kovixileta/ZTrlBS7/48301191012.pdf
    • https://cdn.sqhk.co/liramesot/RQM1je7/zenonia_5_offline_apk_unlimited_zen_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin
c259118a01746357598f5b9848ca1870899c641be46ba83f165c3f70a6717ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5296 bytes
font_01_sfnt_off0000fc84.bin
fea49b0abafde3e37e8e359b40bf6212dc9a88b8147ce5114857322b28ed9ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10228 bytes

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