Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d43b2574b543ee6…

MALICIOUS

PDF

76.3 KB Created: 2021-04-26 02:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc542aa825c51894fd354b49f9bb05f SHA-1: 1119f22cf20346e31bef49e578fc479798685484 SHA-256: 3d43b2574b543ee6dcd9899e604dff30d92c89af9347f6b49b7939fa20d54813
156 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 or phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=jetblue+carry+on+luggage+dimensions
    • https://cdn.sqhk.co/dugixikisim/JYjdlQA/rimubigen.pdf
    • http://kigumelez.medianewsonline.com/50117279326.pdf
    • https://cdn.sqhk.co/turanexode/ibQAs0J/nelaj.pdf
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/serasizuboseniz-xudatokosen-pebot.pdf
    • http://nasufulorejuwe.mywebcommunity.org/bibabuzerix.pdf
    • http://hookup157.site/banomoya_amapiano_remix_song29akn.pdf
    • http://zitalogeloluwiw.mygamesonline.org/basic_life_support_2020.pdf
    • https://wubixuduliku.weebly.com/uploads/1/3/4/4/134466255/runiw-lasogin-fepefuzenosubu-zilalakobajew.pdf
    • http://xufonewujisos.scienceontheweb.net/the_story_of_my_life_summary_chapter_wise.pdf
    • https://cdn.sqhk.co/zadoweferoxe/hiHgdOe/5683382797.pdf
    • https://tifegoguxefufi.weebly.com/uploads/1/3/1/6/131637953/likezuzobipak-gatavubikiwol-walaxilanafosa.pdf
    • http://koolmaxt.online/91374353082qijve.pdf
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/1600971.pdf
    • https://cdn.sqhk.co/vibebexez/Fdjjfh2/7498087596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/28fb8c17-d036-4adb-a50f-3ef9e1b2dd08/python_coding_interview_questions_facebook.pdf
    • https://uploads.strikinglycdn.com/files/8d970ce0-1067-41cd-8a64-dd5fda39a150/wavibokifadedajuxobifisap.pdf
    • https://uploads.strikinglycdn.com/files/17af4f6e-a70e-4dd0-8d5e-be08f24415f7/gypsy_moth_caterpillar_infestation_1981.pdf
    • https://uploads.strikinglycdn.com/files/f13c0bed-9ca4-45bc-9c74-22443575aae4/mosetejakulotabiziruz.pdf
    • https://uploads.strikinglycdn.com/files/541f6a31-a334-4dab-b6b5-41300f3442ba/trigonometry_word_problems_for_class_9.pdf
    • https://uploads.strikinglycdn.com/files/07b6508f-a6d2-48dd-ba73-a904f2bb5432/lutoz.pdf
    • https://uploads.strikinglycdn.com/files/dc1a85dc-2c82-4fec-9d34-6c03f85b39c3/xagijibevabi.pdf
    • https://uploads.strikinglycdn.com/files/ba2f0fe7-1192-47cb-b564-7803e6eb4b33/85823251346.pdf
    • https://uploads.strikinglycdn.com/files/bd0aa7ea-7263-4d38-afbe-a491104b9b6e/are_lowes_john_deere_mowers_different.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_off0000ee61.bin
efae58ebb795dab1a8e61911a0824023d68d4a8763b4ffca03f29509e183a7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 5492 bytes
font_01_sfnt_off000100f4.bin
62e1f2ee6a664533095cf9038bad556c8076987e17b908f24fb5d461376c3291
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10232 bytes