Malicious PDF — malware analysis report

Static analysis result for SHA-256 95106c06058a4a7d…

MALICIOUS

PDF

65.6 KB Created: 2021-02-24 10:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 105b5701adce0cfac005b82a96118f8b SHA-1: 29647c59ebc43b788dfcf326aff52c812f479989 SHA-256: 95106c06058a4a7d9f385042cddca75945721916578ec887c446243e7abb46d4
196 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, including a link farm and invisible links, designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users via web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/wix?keyword=escape+room+level+351
    • http://wukivobezoba.iblogger.org/free_printable_yearly_calendar_templates_2017.pdf
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fec03b3e473e.pdf
    • http://securitycheckingbrowservkcom.xyz/44238912604pc4yg.pdf
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5fe288a53a445.pdf
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/soguk.pdf
    • https://static.s123-cdn-static.com/uploads/4448323/normal_5fe5dad74dec5.pdf
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/85dd295.pdf
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/taxifunejufale.pdf
    • https://rowisinudusa.weebly.com/uploads/1/3/5/3/135310113/popogabegelatob.pdf
    • http://instapresent.site/ronosogexekitoxomufop6v65j.pdf
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/vuvonikujox_buxebipe_zuxorase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xumomevafuvozup.rf.gd/diy_dungeon_master_screen_wood.pdf
    • http://dejudunobagozut.epizy.com/where_can_i_go_to_donate_clothes_for_money.pdf
    • http://kobezitidub.rf.gd/55143717506.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_off0000b822.bin
c8a261600031a4ca7812ad0181507e64ae7124948d85250b0696e1092b81fa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 4992 bytes
font_01_sfnt_off0000c91f.bin
f1e5fe6d7ef5e9589e271cacf199905db6aea5a670356801e0fe2ff1e7d88d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 10100 bytes
font_02_sfnt_off0000ebaa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 4324 bytes

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