Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f34fd1a97ac654a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 01:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5519de573626c10e30975b4e787869c9 SHA-1: 58988b8ecbef605adac54cce80089a4e71456030 SHA-256: 3f34fd1a97ac654a2aff8f7a4fd47a8021b359d0be07c004b80e2a066ef9a538
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('kuzutuzo.ru' and 'gepexoliv.medianewsonline.com'). The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a sense of urgency, a common phishing tactic. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of multiple external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/wix?keyword=mcsa+windows+server+2016+exam+questions+and+answers+pdf PDF link annotation
    • http://gepexoliv.medianewsonline.com/38570123654.pdfIn PDF document text
    • http://lajokuxix.22web.org/siwoku.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/new_free_wordpress_themes_2020.pdfIn PDF document text
    • http://resijunul.22web.org/lamipapaponuzulifisa.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/caseum_amigdalar_tratamiento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukusa/are_undercover_cop_cars_illegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a756640-93b3-4ccd-9787-583ef69345b4/craftsman_lt1000_starter_part_number.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/59331568990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357bd064-3149-48c1-a6fe-339902e0d6ed/how_big_should_a_sample_size_be_in_quantitative_research.pdfIn PDF document text
    • http://ditiziwux.rf.gd/android_sdk_install_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904e98b4-4b24-480b-84ba-ebb852b78fca/how_to_reset_lexmark_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf57550-cd9a-40be-841b-b4abcc5920cb/muwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0d2fc7-1787-4c60-964e-c548cb4c5243/secrets_of_closing_the_sale_zig_ziglar_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/the_road_within_movie_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8f3251-fd19-4345-88cb-294fb0ebaaa8/74896867308.pdfIn PDF document text
    • http://sewadereweben.epizy.com/mathematics_books_for_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c78229d-7d24-4d48-9dbd-6744e9ef09c2/how_to_write_a_synopsis_of_your_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/43855516641.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/kofikozobakum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0d3136-fc62-418a-9549-378b28ea6f32/82521682299.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/advanced_trauma_life_support_atls_guidelines.pdfIn PDF document text
    • http://jiwabesufag.epizy.com/lenetibufatinumu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5980 bytes
SHA-256: 9cb618b32b75140e193a27d43b4b3c68ec1b56ab88d1fef8d941ecb3e19eb277
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 10944 bytes
SHA-256: 2d3aa929cbe4c83eac0efbcb4dfe6df59727faa8005bf51e90aa6ecc78693ef7
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3