Malicious PDF — malware analysis report

Static analysis result for SHA-256 91100057d8f63ade…

MALICIOUS

PDF

79.1 KB Created: 2021-04-27 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2cd09f13949040d52b5dd4a8d8b8044a SHA-1: 25eb3e8b77b7dd98c49b073bff8158ce6b7fba36 SHA-256: 91100057d8f63adea63d46a47e09eea70146faa1f93e5ce9afbe8dbd05a5db8b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xezojetit.ru/strik?utm_term=barcelona+pavilion+elevation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5fe4e0b08340b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_601fbaa4446be.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/ihidNhj/katugobejaximanidap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_60525450d37fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/ecjiNhg/avengers_infinity_war_legends_never_die_mv.pdfIn PDF document text
    • https://cdn.sqhk.co/jukapaba/icgiGhj/red_cross_charity_gala_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/ajfhgif/new_york_city_travel_guide_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ff0ddb6daeb7.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/eFjbggN/tmnt_rooftop_run.pdfIn PDF document text
    • http://wutujirola.22web.org/43296361289.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/jieigha/28245516543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomezisil.epizy.com/50703365951.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/go_math_grade_1_teacher_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccb59c2-d6bb-4400-882c-14e0abbcc867/wokuvarobepojogotem.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/prefixes_suffixes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683f4e1e-6e9f-4853-b8f9-4a20a23d48dc/55728409794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e575a239-791f-45c2-b721-9bb269fde0f4/sistema_endocrino_para_nios_animado.pdfIn PDF document text
    • http://sulupajus.rf.gd/how_to_train_your_dragon_3_on_netflix_canada.pdfIn PDF document text
    • http://muvusibose.rf.gd/boval.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/ch_7_tv_guide_sydney.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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 4860 bytes
SHA-256: 915188afb1da40ee4fc3dcc6752f0091d5318837f519c5a82d6ecfe57a3bf456
font_01_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 11456 bytes
SHA-256: c81527f92bb216d52b01cae9cfe20500a3b2cf6ecb44af518eab8d32cf9f5e60

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