Malicious PDF — malware analysis report

Static analysis result for SHA-256 8939cca20783f3d1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 11:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f8b7768bf2317fdc6737c14b15a009 SHA-1: 51c59c87036553da2f209ac636dcba4fcb5f56eb SHA-256: 8939cca20783f3d1667b02f6596ae4d49d33c85a0b5124802d1ebcc423829d64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://nipisod.ru/123?utm_term=civ+3+for+android', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of external links.

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://nipisod.ru/123?utm_term=civ+3+for+android
    • https://cdn.sqhk.co/xuvuxemoguf/nXEjehh/parrot_voice_recorder_for_iphone.pdf
    • https://cdn.sqhk.co/livulopo/didhjrN/ring_a_bell_meaning_origin.pdf
    • https://cdn.sqhk.co/bujiwamovul/Dvmhiid/duturazarijokud.pdf
    • https://cdn.sqhk.co/libodinidep/hjqUk2E/xaked.pdf
    • https://cdn.sqhk.co/zetanitanedo/jgdcVgg/word_search_pro_answers_finder.pdf
    • https://cdn.sqhk.co/sanobude/QifVx3C/fagebujiwopada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/12ac3a33-14ef-47a8-9c2a-3fea71a9ce63/what_is_all_souls_day.pdf
    • https://uploads.strikinglycdn.com/files/0905410a-496d-4944-9fc3-f1aa235172fc/bluebeam_revu_for_ipad_cost.pdf
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_1b6d52e84c614aba9069160f6de560f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6381380-598a-4bc8-8f07-5143a6aecf96/49703183716.pdf
    • https://uploads.strikinglycdn.com/files/4a74f6bf-e7c3-43fd-b325-3ab51cdf26a1/how_to_set_time_on_citizen_eco_drive_perpetual_calendar_wr200.pdf
    • https://uploads.strikinglycdn.com/files/885584cb-8f59-47ec-a443-5ced3de9658d/inteligencias_multiples_y_cuales_son.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_acd513a0f3774672934b6fb73c6b915a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5da427e-fcd8-4ee2-aee5-6adc82e02b6b/porsche_911_ownership_cost.pdf
    • https://uploads.strikinglycdn.com/files/456667fe-6545-4786-95de-8e5930d794b4/boss_dr_5_manual_espaol.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_b2c67ae2652d4bcf9c0b40836af4982f.pdf?index=true
    • 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_off0000e174.bin
05102bcea59a4c71b7686fd95062fad421b174bba433b8161a2cddc8eb0dd470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 4528 bytes
font_01_sfnt_off0000f0e0.bin
b86972f1afceb2ed3a100d15113a5d362f0840824994d0221e1e26ae08fac3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 15348 bytes
font_02_sfnt_off00012037.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 4324 bytes

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