Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0a31698169c8ef…

MALICIOUS

PDF

68.6 KB Created: 2021-03-28 22:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce3561eb598d8d9675a602913b3142cc SHA-1: 1108ef4aa393c3e385e01781a22aad409e20e061 SHA-256: dc0a31698169c8ef1f160371fd7e00574138186ae3ac2e2d5c5635e855b7d979
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://pelibifir.ru/award?keyword=vk+publications+accountancy+class+12+solutions+pdf PDF link annotation
    • http://shoppingyxplus.xyz/char_broil_red_smoker_box27qre.pdfIn PDF document text
    • http://armlur.space/how_to_turn_off_car_alarm_with_remotevgas5.pdfIn PDF document text
    • http://wersita.fun/renaissance_architecture_ppt_free0sbf0.pdfIn PDF document text
    • http://chaptejvxz.fun/xokelutexeganj7pqy.pdfIn PDF document text
    • http://penerete.66ghz.com/angsana_new_font_free_for_mac.pdfIn PDF document text
    • http://hydrofthol.space/yamaha_htr-6130_manuale_italiano9wvo9.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/characterization_worksheet.pdfIn PDF document text
    • http://uanews.website/ejercicios_de_scratch_resueltos7ttuj.pdfIn PDF document text
    • http://xetelafeke.iblogger.org/metro_map_paris_france.pdfIn PDF document text
    • http://dihtyar.online/92990121657mg9ve.pdfIn PDF document text
    • http://teksalon.xyz/maths_crossword_puzzles_with_answers_for_class_9_cbseup3qa.pdfIn PDF document text
    • http://bloodcraft.online/transport_coordinator_job_interview_questions_and_answersc58fk.pdfIn PDF document text
    • http://pibumutibol.22web.org/biology_booklet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jubogaju.atwebpages.com/why_is_my_fios_router_blinking_blue.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/equivalencias_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/30590637016.pdfIn PDF document text
    • http://lefegosab.epizy.com/tetezekinumitugo.pdfIn PDF document text
    • http://nizapowedasa.rf.gd/89751341556.pdfIn PDF document text
    • http://zifasodokid.epizy.com/bamavufenepuduxoj.pdfIn PDF document text
    • http://labotiz.rf.gd/testo_junkie_discussion_questions.pdfIn PDF document text
    • http://susabumo.atwebpages.com/47280857440.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5508 bytes
SHA-256: c49b616b968624cb2022999f3b91afd5d3d255b804bc27e079822d2d161ebc91
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 10520 bytes
SHA-256: 3b4edc231794d6573083987d8c895b7c0b973bdc473fa38a14a6b00bfd442599