Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebfd4a558a53fc4…

MALICIOUS

PDF

92.3 KB Created: 2021-03-28 19:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 23c4ca596c2639ac89127218c06db6b2 SHA-1: 57e70b22922ad2cda120b31979883bd0580c0f71 SHA-256: 1ebfd4a558a53fc4a48ccad1a627f8d40706f3328f5da9279674fbdc3db2a70d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=multiwii+2.3+navigation+gui+download PDF link annotation
    • https://cdn.sqhk.co/pajijolabalu/iDJPjik/simple_mode_launcher_apk.pdfIn PDF document text
    • http://cosmosqrab.online/67434820346xxb9b.pdfIn PDF document text
    • http://alteramaks.world/dell_optiplex_620_drivers_for_windows_xp8vkif.pdfIn PDF document text
    • http://persequen.com/487602497246ud7l.pdfIn PDF document text
    • http://likelid.xyz/vaponiwebopavdt9eg.pdfIn PDF document text
    • http://tvoyoproc.fun/que_es_un_modelo_de_liderazgo_empresarialuxhvs.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/iCghiiz/android_device_policy_apk.pdfIn PDF document text
    • http://wegansit.space/hp_color_laserjet_enterprise_cp4025_service_manualyfnsu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/8ieV0jh/airtel_online_recharge_via_net_banking.pdfIn macro / runtime command snippet
    • http://foyou.store/group_d_answer_key_linkkvh1z.pdfIn PDF document text
    • https://uploads.strikinglycIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowixopepe.epizy.com/beats_solo_2_wired_one_side_not_working.pdfIn PDF document text
    • http://dunoxoxuri.epizy.com/big_sean_songs_2019.pdfIn PDF document text
    • http://vifowas.epizy.com/after_chapter_1.pdfIn PDF document text
    • http://zorogeloma.epizy.com/inherit_the_wind_movie_worksheet.pdfIn PDF document text
    • http://zabetexukiked.epizy.com/78177442856.pdfIn PDF document text
    • http://tiliken.rf.gd/nafidukokuzutanuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87de8c96-c29e-4e84-a1a5-74594e9a4244/the_graph_above_shows_a_firms_long_run_average_total_cost_curve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0969e4f-c4cc-4f47-af17-032afc200b2e/pinaxomawirobin.pdfIn PDF document text
    • http://mofomunor.rf.gd/57078885354.pdfIn PDF document text
    • http://wisotoginiso.rf.gd/windows_powershell_command_line_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e334e969-74a3-49e8-adb6-f20b492eba2f/43181408045.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/32065021327.pdfIn PDF document text
    • http://soromivimurug.epizy.com/84255582478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9561e2f3-a7d3-42d4-8c35-9acd297ac90a/how_to_turn_on_a_tappan_electric_oven.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 5204 bytes
SHA-256: 013af3c10a6d0ec357aa0bec0b165f08da80a0b28e8ea17ecce32fb625706137
font_01_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 12428 bytes
SHA-256: 224cc3db06b4429bbce3ee1ad298e46f8257a2a4a41e0b59c47d7666687e0c4a

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