Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0eac574878d40d…

MALICIOUS

PDF

85.2 KB Created: 2021-04-09 06:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 183227b6a8bee9076d627aeffef7309f SHA-1: a257d77df7e37fa7e07d3d3eb80e805e31d1374b SHA-256: 5f0eac574878d40d256feea7ba293ed4beffb2cfcd1bb13d7607b83fcf278a3b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=motorola+xts+5000+release+date PDF link annotation
    • https://cdn.sqhk.co/xawefigi/cghb7gc/lunas.pdfIn PDF document text
    • http://1xbet-registrat.site/exercice_de_calcul_de_dose_infirmier_avec_corrig10lqk.pdfIn PDF document text
    • http://dowuwomili.iblogger.org/cognitive_skills_definition.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/2997170.pdfIn PDF document text
    • http://thefortykuti.com/riguguzikigunowate6k59d.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/d0ce28.pdfIn PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/c6f9c19df.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/jVFTvuj/vakamedenabujasesizu.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/nibonusa.pdfIn PDF document text
    • http://futuroke.iblogger.org/d_d_barbarian_5e.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/fjgjfDc/idle_drops_low_when_stopping.pdfIn PDF document text
    • http://barbanapoli.moscow/practice_10-2_areas_of_trapezoids_rhombuses_and_kites_answerswklsd.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/5iiicjf/transfer_paper_tattoo.pdfIn PDF document text
    • http://duribil.iblogger.org/flames_of_war_rules.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/zamuxojenademapuja.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/suweg_fidosopazetite.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/cc0593cdd0cf5.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://vejaxuka.epizy.com/2444240485.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_d7cc8c2ec5d44c338339de7c6e582aac.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_546312f8949242c9801480dadee7d6d9.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_59056ef87769439c94f38dd7baa529ba.pdf?index=trueIn PDF document text
    • http://seropurubok.epizy.com/turigubexamiwus.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_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 4792 bytes
SHA-256: 96cac6d4d8dd788f2e20b1dca2294fe03069812f40666fcb26016b1910bf8875
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 11776 bytes
SHA-256: 37ed9da4b7825fe8bbd0901a382340f2777d3a9910dd3a8c0c68ff0d91072c65
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333