Malicious PDF — malware analysis report

Static analysis result for SHA-256 43be88f57ee539d6…

MALICIOUS

PDF

84.3 KB Created: 2021-04-06 23:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ee1e2c27d3e16a4baab1417b1c44969 SHA-1: d844c76bff01afbc5ceb7fa7128da231bdbbb3a3 SHA-256: 43be88f57ee539d64f8fd0e18313ac68654f9f1fc311adea7905ef59936663f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'https://lozipotod.ru/123?utm_term=jo+bheji+thi+dua+dj+song' and 'http://vajogeboru.iblogger.org/ifttt_trello_google_sheets.pdf' being prominent examples. These elements suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=jo+bheji+thi+dua+dj+song
    • http://vajogeboru.iblogger.org/ifttt_trello_google_sheets.pdf
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/taxowosopupem.pdf
    • http://dopadogexegox.22web.org/pdf_tools_split_merge.pdf
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/wexukib_tixaxekapezade_mawojowekimuxu_mifofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/24a12d2a-f2e4-479f-b2d6-52f464ad8749/why_have_my_bookmarks_disappeared_on_ipad.pdf
    • https://uploads.strikinglycdn.com/files/2d7dc0d2-baae-4b16-974c-1a2757140548/titufajivenitap.pdf
    • https://uploads.strikinglycdn.com/files/efcfaad4-838d-4a9d-a351-936dd5c97d26/tuxepem.pdf
    • https://s3.amazonaws.com/lazolu/avast_internet_security_free_license_key.pdf
    • https://s3.amazonaws.com/ziwuvijevo/53149135074.pdf
    • https://uploads.strikinglycdn.com/files/ee7bbb40-a95b-4f0e-9b50-f73edfc86b9a/omron_blood_pressure_monitor_hem-432cn2.pdf
    • https://uploads.strikinglycdn.com/files/b8f93ec3-fc7a-4d64-afb7-bfdf6d9e9b93/xememilori.pdf
    • https://s3.amazonaws.com/lixuduwonifa/43314115550.pdf
    • http://niwewoxupasobu.epizy.com/novibuxijobininedosivit.pdf
    • http://toxodetu.rf.gd/what_questions_to_ask_when_buying_solar_panels.pdf
    • https://s3.amazonaws.com/vabemavuputenif/free_plant_maintenance_schedule_template_excel.pdf
    • https://s3.amazonaws.com/zuguvoxoki/eton_radio_charger.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d735.bin
8756e7b5ff0c3550d8027f0fa8c12e80927f3f29ec8aeda7cc3d469a4e18d51c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10024 bytes
font_01_sfnt_off0000f8c8.bin
a270d9bb67bc718fe0a7d1702561d7e5e4f36d89e471701e2a805896caf05f77
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 5164 bytes
font_02_sfnt_off00010a50.bin
fa502c6a894373e13dbfdac1e9584ef2dd50c5a2e1c47514c969842a438757aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 5272 bytes
font_03_sfnt_off00011b69.bin
abedd7fab166ecc84f4dbcb3839f25a8da8605278af306ee9277e39081f559f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 11808 bytes