Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eba75171f58638…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 07:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3542c9e0b544d1b896e661dab6df5220 SHA-1: a403f154dd9970e32af2bb64fc2a97c880ef67e2 SHA-256: 98eba75171f5863842774061910b78bfc75f0a1d14f7d96407735961ff5bff34
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on suspicious domains, indicating a link farm for distributing malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to trick users into downloading further malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5313

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://zajinet.ru/award?keyword=bengali+book+pdf+file+download
    • http://lishop.site/68568348048rhdbw.pdf
    • http://delayikapy.xyz/addition_to_20_worksheets_year_15cvpi.pdf
    • http://oneitstore.info/nibinajugeqzkgj.pdf
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/bewejeximus.pdf
    • http://gagarinski.su/openintro_statistics_amazonwchqd.pdf
    • http://tikanaw.mypressonline.com/11058782181.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/kologedaxusetis-daputobenuperi.pdf
    • http://lamovingcompany.com/xodidipo4rgdr.pdf
    • http://fedezin.scienceontheweb.net/active_and_passive_voice_exercise_download.pdf
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/7446463.pdf
    • http://formulamoney.top/jugufebabegiwawogikob8r3o.pdf
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/fewimobe-nolibaboje.pdf
    • http://gadatoreneperil.mygamesonline.org/difference_between_systematic_error_and_random_error.pdf
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/4198034.pdf
    • http://zudepogumo.medianewsonline.com/mappa_tram_amsterdam.pdf
    • http://simultaneously.space/how_do_you_get_a_lamborghini_in_gta_5_cheat_pcx9ai0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c305c290-8f93-4d13-8a7d-0762cadca1bc/what_are_warm_fuzzies.pdf
    • https://uploads.strikinglycdn.com/files/05299b07-6a57-4b99-9c72-a924d4bb2c81/4_pics_one_word_level_239_answer.pdf
    • https://uploads.strikinglycdn.com/files/b2f46065-121d-42f2-acee-498f0f2a77da/medicinal_chemistry_research_scimago.pdf
    • https://uploads.strikinglycdn.com/files/4451ffe9-1e45-4250-a540-bdfa829e6735/what_is_the_army_rangers_saying.pdf
    • https://uploads.strikinglycdn.com/files/74c752dc-84d3-4a15-b700-d9875f0bfc10/what_is_kants_copernican_revolution_in_philosophy.pdf
    • https://uploads.strikinglycdn.com/files/7d0b724b-3ea6-48fd-93b1-441f00fad6e0/83106940093.pdf
    • https://uploads.strikinglycdn.com/files/a53509a1-5f16-4765-bfd1-aae38107b1a7/cracking_the_sat_practice_test_8_answers.pdf
    • http://nemenarubaz.atwebpages.com/vehicle_parts_catalogue.pdf
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e766.bin
de2f95381e7ef113057e734529c1f699781e2f084babb19ca5210657c86fa188		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 4988 bytes
font_01_sfnt_off0000f870.bin
b9b9ebf8b882e83ee2299758c4f7ea24a0d819de11b796ffe6b5bf556ff8ba26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 18244 bytes

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