Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba9da0568cf1bc2…

MALICIOUS

PDF

88.3 KB Created: 2021-04-06 20:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 17d6364b82d230f21a962e67ebf8d081 SHA-1: e0e5bd6cd84755767340034e2e5a02b47adf1139 SHA-256: aba9da0568cf1bc20c10c14c6d48b31f770538437ec062b95face516b9413d94
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=competency+based+interview+questions+and+answers+for+senior+managers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469359/normal_6032f0b561906.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/les_mthodes_d_amlioration_continue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5ff8fcb16bd6c.pdfIn PDF document text
    • http://bopepon.22web.org/21779223363.pdfIn PDF document text
    • http://ruwazelenefago.22web.org/ncert_class_11_financial_accounting_part_1.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
    • http://lowadof.epizy.com/zetefagutopujeginatifu.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/61510855143.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/how_to_set_up_voicemail_message_on_vtech_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71318a7b-b9ee-4e60-a984-def87285edce/which_dect_phone_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4e9f9c-ab5a-4cbd-bdb4-6aefbea6b5b6/download_conexant_audio_driver_windows_10_hp.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/sutowitarizexo.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/7256225191.pdfIn PDF document text
    • http://bivatirovasivoj.epizy.com/vazetobadewuta.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/95331750818.pdfIn PDF document text
    • http://karajifaderiwow.epizy.com/performance_appraisal_samples_doc.pdfIn PDF document text
    • http://dofumuligo.rf.gd/48150388872.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/articulos_cientificos_sobre_energias_renovables.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/emmanuelle_3_parents_guide.pdfIn PDF document text
    • http://sazevaxorofezag.epizy.com/jemekileganedigazot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf1d894-b000-4fed-b4d8-17e5b663a342/verizon_router_red_globe_reset.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_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 5868 bytes
SHA-256: ea16373f066c46038e82af0bcb178c458460c9be5bbf2cc0f5175a4c5c58645a
font_01_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10968 bytes
SHA-256: 1ad6e90aff66c75368e15c4d972aa3352a1edd09495f27cda90e04a63837359b
font_02_sfnt_off000144fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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