Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bdf21b1c4283a6…

MALICIOUS

PDF

93.1 KB Created: 2021-03-28 06:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c31d8561c125cae90f556f784250c61 SHA-1: 91f4b9bc2431f5a210faa9c5d0248c5c47f66a7e SHA-256: 34bdf21b1c4283a6119bc5243539c1166e1d31dcf3e20df4993660ca4c7f0e3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/wix?keyword=gopro+hero+6+session+manual PDF link annotation
    • https://cdn.sqhk.co/varugefezum/82oibjh/measuring_snowfall_ielts_reading_answers.pdfIn PDF document text
    • https://wupebeziwemipi.weebly.com/uploads/1/3/5/3/135315897/c8c9da51.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/BhhigPR/81017128837.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/zimorajuwegorugomo.pdfIn PDF document text
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/pumijanidawowuraxene.pdfIn PDF document text
    • http://devlp.design/o_que_pedir_de_presentefj3hc.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/ji1jfji/31327279202.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/applied_behavior_analysis_for_autism.pdfIn PDF document text
    • http://health-top.ru/komitulimofewap4sb9.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://nojozorupugi.epizy.com/present_simple_tense_exercises_with_answers.pdfIn PDF document text
    • http://bapifodog.epizy.com/babel_full_movie_300mb.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/bmw_e90_brake_fluid_service_reset.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/35757245808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cf570d-002d-47eb-b4de-cba09d66c160/isometric_projection_drawing_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065528ef-0100-42e1-8417-d5067fefdd55/53791965089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7700433e-6de1-4303-907d-e6c949a2173d/digital_communications_specialist_resume.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_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 5048 bytes
SHA-256: 8d962c12e850ccace5744c0e43eb377fd0803e57103aa83fe16397b8483fa7f5
font_01_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 14480 bytes
SHA-256: b1b01f5cd3c3d1cbd722ee32ae0ba22720ae824da6eafe2184ba27510eccf82b
font_02_sfnt_off00015903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15903 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c