Malicious PDF — malware analysis report

Static analysis result for SHA-256 36676dda4f2d70af…

MALICIOUS

PDF

72.6 KB Created: 2021-04-02 22:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a28a1016f5114a0e50a6d09bf91054c SHA-1: d81c2ac1f62d68f7d3463d312ed38d0f2ba554c3 SHA-256: 36676dda4f2d70afb237baea86dadd5c9aec7ed061b3507597099945ad01575c
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8062

Heuristics 4

  • 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
  • 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/strik?utm_term=primeros+auxilios+en+bebes+pdf
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/xevesozazavi.pdf
    • https://cdn.sqhk.co/pimepojuti/ieHmiK8/dialogflow_es_agent.pdf
    • https://cdn.sqhk.co/zipodumup/hbsryTG/moto_z3_camera_not_working.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/turaxel.pdf
    • https://cdn.sqhk.co/napumefu/jeNPgc0/89886909305.pdf
    • http://lestyprin.online/23571570656km56w.pdf
    • https://cdn.sqhk.co/zibomevuguli/jibwwhh/image_editor_mac_open_source.pdf
    • http://letxxnx.org/maths_book_class_6b7atc.pdf
    • https://cdn.sqhk.co/pufuxogife/sxEPUhf/best_sensitivity_for_pubg_mobile_no_gyroscope.pdf
    • http://on24-system.club/jetaridodizozatumokiwcd4j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a2cf5eb-9cac-4e9d-8653-42aebd7d8391/42306071021.pdf
    • https://uploads.strikinglycdn.com/files/551e01f8-72d1-438d-a1a2-a7ad064dbabf/43986664701.pdf
    • https://s3.amazonaws.com/tibitexil/33248431808.pdf
    • https://uploads.strikinglycdn.com/files/56f826bc-d4b7-4804-86af-d6889650c540/bissell_revolution_carpet_cleaner_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/71cc67bd-3992-4606-b393-c2b0eb24bb3f/ham_radio_deluxe_for_mac_download.pdf
    • https://uploads.strikinglycdn.com/files/96f82ecc-bf0c-4b16-92a0-88bdebe84074/7825849274.pdf
    • https://uploads.strikinglycdn.com/files/62297313-f09f-4a67-aead-04a9215b9080/colon_and_semicolon_exercises_with_answers.pdf
    • https://s3.amazonaws.com/vuraradaso/is_chi_oil_good_for_your_hair.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin
13f9ec71492b1b8bcf3beb680bbd8503b925f689be185610bf193ca38196cf3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5396 bytes
font_01_sfnt_off000101cc.bin
024ad369815d748c6b103d00f6c4397220a6b6159159139a933adf4c2b51f168
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11624 bytes