Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd23c777d5b0ad5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 21:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7da0a5d292fbfab0b7574c9a59b19f03 SHA-1: db2c75544c7bb892961c9eb66510ee2a6d4dd298 SHA-256: 4dd23c777d5b0ad5673b38a38da4e67f0a104293276ff1849c3d422b9f590150
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for SEO spam or phishing. The primary URL, https://jacksth.ru/wix?keyword=bulova+marine+star+battery+replacement, suggests a lure related to product information. While no scripts were directly extracted, the PDF structure and the high number of external links, including a detected link farm, indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=bulova+marine+star+battery+replacement
    • https://cdn.sqhk.co/mixaluwekitu/dgtUSEi/46984418460.pdf
    • http://pumba.fun/gufakasonibukotovokonahp7zx.pdf
    • http://sikudej.22web.org/eye_tracking_a_guide_for_applied_linguistics_research.pdf
    • http://bhd-management.space/91159007357k59e.pdf
    • http://1yamal.space/what_is_opponent_process_theory_in_psychologyabskl.pdf
    • https://cdn.sqhk.co/werutojij/eIaigKs/carrom_board_classic_game_free_download_for_mobile.pdf
    • http://smartcreditscore.info/bopomupizomozoxawamewy3qe.pdf
    • https://cdn.sqhk.co/suwojixuwebi/ijiAigc/79499365648.pdf
    • http://derewopenila.22web.org/building_management_software_free.pdf
    • https://cdn.sqhk.co/tibakekavero/jjhijfR/child_care_near_me.pdf
    • https://cdn.sqhk.co/kukisigafumi/0eqyhhJ/beat_blade_dash_dance_devil_slayer.pdf
    • https://cdn.sqhk.co/zexupibo/iUHghoi/ninja_raiden_revenge_hack_apk_download.pdf
    • http://forkidsshop.online/crack_the_binary_code_worksheetg6par.pdf
    • https://cdn.sqhk.co/leloxoreje/ja3oghe/nuworabarosotumivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_288450af6adc4cf685a1c76a24835622.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_68384ccc61e14546b8c3fd85fda41aca.pdf?index=true
    • http://zoribele.epizy.com/truecaller_name_and_address.pdf
    • http://pejinubonuxus.epizy.com/android_online_emulator.pdf
    • http://litiwevapebani.epizy.com/abwab_us_sarf_jadeed.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_e72b53fd26c749a884bc060e6607915a.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c5043df7531444df83eb30bac7913694.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_48b22beafaee43eb911377c267fadffc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb8.bin
9fea6cce8985ba95665a8495dbf1cd0b150ec8d0f4558051f76a2c96c7580111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5432 bytes
font_01_sfnt_off00010023.bin
ed08ad836dc09bd7856a74b759265246d520bd77fb0e4c32458079087b1deee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10628 bytes

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