Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bd6d9aa2817df4…

MALICIOUS

PDF

81.2 KB Created: 2021-03-22 13:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66b2770e4ec551e3000a774cdd4edba4 SHA-1: 51f28f109edcc2e91c85a11a96284b1121538c4b SHA-256: e3bd6d9aa2817df4f7d9f539498c931ed3de15d7b283ecc07e1941f44fb8453b
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution scheme, indicated by the presence of a fake CAPTCHA prompt designed to deceive users. The document also contains a large number of external links, many of which are likely part of a link farm or lead to further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://resalured.ru/wix?keyword=glastonbury+library+hours
    • https://cdn.sqhk.co/pemanunid/HF9WGja/57233032882.pdf
    • https://cdn.sqhk.co/xorazasuno/ogemhar/music_ringtones_inktaler.pdf
    • https://cdn.sqhk.co/wipabamof/cL0Vqgj/rigavevijejaximolajon.pdf
    • https://cdn-cms.f-static.net/uploads/4454162/normal_600d4355254ad.pdf
    • https://cdn.sqhk.co/sesijisova/cggTdDX/20834141317.pdf
    • http://bizuzagewad.iblogger.org/62614111466.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601319d7912b5.pdf
    • https://cdn.sqhk.co/naxusepimosa/ejc9tji/60_70_80_music_radio.pdf
    • https://cdn.sqhk.co/dejijadu/cggbd71/77108313865.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_603a78ab2e532.pdf
    • https://cdn-cms.f-static.net/uploads/4475875/normal_6028997f72451.pdf
    • https://cdn.sqhk.co/lebogomatoze/ieidsjc/pajenomaluketofepumomobax.pdf
    • https://cdn.sqhk.co/jirudumom/ahjXMhd/823431207.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_5fdaea1e2c40f.pdf
    • http://fenarumobajixu.22web.org/aa_12_steps_and_12_traditions_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_388392311b6c4de28ef1b645fb134411.pdf?index=true
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_10fe95cd9edb4e6b82610631b2f3a0c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41af0c38-1e45-430d-822f-ac524d74b8b7/25625143299.pdf
    • http://merixokove.rf.gd/teora_del_modelo_atmico_de_schrdinger.pdf
    • https://uploads.strikinglycdn.com/files/8a324c89-5764-4868-a0e0-4212111076fc/troy_bilt_bronco_owners_manual.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_3165781b1d1f4e14be55be26420dcc99.pdf?index=true
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_e53f35bab19d4498b96ff28722b77112.pdf?index=true
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_a7809ec843e44f81b32e0f5a5daf7cbb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/609308b5-31ac-4257-afed-890093eb169e/what_setting_should_i_use_on_my_fertilizer_spreader.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3f.bin
7703e8547283c44e927c6c91b29d60ce6b945cdeba6ed318badf33ea51802ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 5044 bytes
font_01_sfnt_off00010f66.bin
f3f5c5ff9c63c583683a7da9fe6840f28834a687bc59339b66d0cad9a1bec1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 12116 bytes

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