Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef756a360738649c…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 20:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1825c368093368af76267cb204c18678 SHA-1: ebda7f10b5937f16e3c7c257a80175aa416aef1b SHA-256: ef756a360738649cc5593ecaa60e0a79c6a807cd415224802417dd37fc64fe06
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'https://kuzutuzo.ru/strik?utm_term=crosman+1077+silencer+package', suggesting a phishing or content-luring attack. The PDF structure and the presence of external URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kuzutuzo.ru/strik?utm_term=crosman+1077+silencer+package PDF link annotation
    • http://katermore.ru/scrabble_rules_and_regulations0fa4t.pdfIn PDF document text
    • http://bio-ita.fun/xamubowewulajaek537.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/wubugajevutuvejitupe.pdfIn PDF document text
    • https://legipulevigo.weebly.com/uploads/1/3/2/6/132695741/00dca36de3.pdfIn PDF document text
    • https://kegipulavuraruz.weebly.com/uploads/1/3/1/1/131163865/mozuzumulitibir.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/natunafawuza.pdfIn PDF document text
    • http://xefakuwejufo.iblogger.org/70310963157.pdfIn PDF document text
    • http://naturebiolog.fun/netgear_wnr1000_router_loginnx9f6.pdfIn PDF document text
    • http://uscreditreport.info/919103330893yoyp.pdfIn PDF document text
    • http://cuzinfo.ru/six_records_of_a_floating_lifezhem2.pdfIn PDF document text
    • http://zinuxuf.22web.org/58702233808.pdfIn PDF document text
    • http://kupidarinab.22web.org/how_to_connect_lg_nb3530a_soundbar_with_wireless_subwoofer.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/choosing_statistical_tests.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwujugisijema.epizy.com/expected_salary_answer.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/abu_bakr_al-_baghdadi_biography.pdfIn PDF document text
    • http://luwaxilozaraxo.rf.gd/ebs_aday_retmen_kitab_2020.pdfIn PDF document text
    • http://pakuvoxaje.epizy.com/35180647124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0b189b-de6c-4f79-bc55-2e50d422d319/dobimanav.pdfIn PDF document text
    • http://gozudivigel.epizy.com/moradezipavoloxodufog.pdfIn PDF document text
    • http://vevisadoko.epizy.com/admin_template_angular_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e15b506-3e6a-4909-a88b-7b404c19fa20/the_art_of_seduction_robert_greene_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d010cc-7cb4-4354-854f-06d74710c1c6/data_science_major_berkeley_requirements.pdfIn PDF document text
    • http://ziwebizivag.epizy.com/honda_shadow_vt1100c2_exhaust.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda30680-28bf-402a-acfb-d04b0a468433/what_can_you_drink_on_advocare_10_day_cleanse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa2c10b-4fb7-4c08-aaef-4d8214f1db8c/91282136236.pdfIn PDF document text
    • http://tobezizasatixib.epizy.com/jolubogavalu.pdfIn PDF document text
    • http://pajipiruk.rf.gd/29569297928.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_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 5496 bytes
SHA-256: 2fbc4ba08dc291192b963b87f7b33eec18fe84e2066e295800555ef232410cb9
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 19164 bytes
SHA-256: c514f6bc269970d85731fe64d6313a3a3a4ce013d79ef9e96ccd635e7055380f