Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c620497e3653e3…

MALICIOUS

PDF

79.7 KB Created: 2021-03-26 08:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cdddc01d9529356bb457227e14277c1 SHA-1: 2b1546d3ce155b670a0297823faad85426b90443 SHA-256: d9c620497e3653e3786d3876ecc47f420318233230ffcb0ede2521b004850187
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 other PDF files, indicating a link farm or SEO poisoning attempt. One of the embedded URLs, 'https://crophysi.ru/wix?keyword=geometry+lesson+8-2+special+right+triangles', is likely part of this lure. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=geometry+lesson+8-2+special+right+triangles
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/5505831.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_6022bec8b9e02.pdf
    • https://cdn.sqhk.co/figegixo/hhdL0ib/doon_defence_academy_dda_admission_wing_dehradun_uttarakhand.pdf
    • https://cdn.sqhk.co/reriwoduriju/3kyPiep/microsoft_planner_in_teams_ppt.pdf
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe65ef1ead54.pdf
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/surujexakana-zevew.pdf
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/gipepiwabojiro-vizoxuza-rizunuwote.pdf
    • http://fefiwizam.sportsontheweb.net/what_is_the_cheapest_ipod_you_can_buy.pdf
    • http://zitukuwekoba.sportsontheweb.net/important_days_in_malayalam_download.pdf
    • http://xuxetosufuzo.getenjoyment.net/9956628177.pdf
    • https://cdn-cms.f-static.net/uploads/4380209/normal_601edd9f31232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nokiva/makafinagakag.pdf
    • https://s3.amazonaws.com/tobojelusiwi/best_sound_boost_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/03e66382-471e-4364-89f3-92a4eab0fc08/al_quran_in_bangla.pdf
    • https://s3.amazonaws.com/vuterijoze/gizale.pdf
    • https://s3.amazonaws.com/zalomi/57184982864.pdf
    • https://uploads.strikinglycdn.com/files/df0db126-c267-46a1-8c8d-86124a3287ff/civ_6_gathering_storm_no_rise_and_fall.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_off0000e963.bin
6aa10da678a5ac7e5565391dd3b9ecd1f725476e53acc2401a240e48dec2a9f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5624 bytes
font_01_sfnt_off0000fc6a.bin
f374b04dfaffa5a09e0ec1c2ab4d0c54e8f43ba31935a986da12cff88147fb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 11344 bytes
font_02_sfnt_off000122ff.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 4324 bytes

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