Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2367d23626c5d52…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 19:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c86c893e81177f5f7dcb1a920967b819 SHA-1: 6fbf4e54a574b606d42a1123343d84af6fe5c012 SHA-256: a2367d23626c5d5266ea20aedd36bfeae20dc0e1d8bd08475957f99a661b9ffc
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with heuristics suggesting it functions as a link farm hosted on disposable domains. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=important+days+in+pdf+file PDF link annotation
    • http://sluzhba1.net/06_ford_focus_owners_manualhc83r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_6041cd16e93c0.pdfIn PDF document text
    • https://pofitokibifezaf.weebly.com/uploads/1/3/5/3/135394855/relijozakilew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402964/normal_5fe0df1424468.pdfIn PDF document text
    • http://meetchambre.xyz/elementary_geometry_for_college_students_7th_editioni79sc.pdfIn PDF document text
    • http://lazakefezives.mygamesonline.org/advantages_and_disadvantages_of_computer.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/resumen_del_capitulo_6_de_el_principe_de_la_niebla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_6026b4c1ad538.pdfIn PDF document text
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/6970536.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/dadepukaxikowebagakomuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_60354ed559c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6015dd80eb214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_602840d3641e7.pdfIn PDF document text
    • http://lojasamericanasbr.com/rufewifovogubaf16pp.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/sovugixuribujaxut.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/00112ece225e0.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/24986009858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_60415535e7269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenasejubibe.atwebpages.com/northern_blotting_technique_steps.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/12925552658.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/verijasivalasaxidijulut.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/air_pollution_control_a_design_approach_4th.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_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 5224 bytes
SHA-256: 3647db937bc622c2f6796b9e830edcf994d9144255aaeabacc1157ee753dd531
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 11276 bytes
SHA-256: 9e88ce61031892c9c57e64fb402227c0639048d3b0d85c9aa208ffbf2c7d0e48

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