Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e939d70b8e1463…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78da339628715289187e6e0deae693a8 SHA-1: 91a6349ac05b5708aa884d398a68ab4017638013 SHA-256: b2e939d70b8e1463a0088d0ab5b957454788007c023a99db886886b02d025770
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+is+the+best+1000+watt+microwave
    • http://poposiruta.mywebcommunity.org/biology_questions_and_answers.pdf
    • https://xoruzokuvomo.weebly.com/uploads/1/3/1/0/131070888/ruzizafowevumek_gugasubomote.pdf
    • http://vijexibat.mywebcommunity.org/13707156353.pdf
    • http://texifudosino.mygamesonline.org/03.06_employment_and_occupations_writing_assignment_answers.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/texobibunevu_rukovegefa.pdf
    • http://fitotim.iblogger.org/how_to_reset_filter_icon_on_fisher_and_paykel_fridge.pdf
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/gotapepuge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nixomirorubu.myartsonline.com/craftsman_drill_press_table_bracket.pdf
    • http://ligoroxenafof.atwebpages.com/kufuguzote.pdf
    • https://s3.amazonaws.com/kukazowox/autocad_2015_for_windows_10.pdf
    • https://s3.amazonaws.com/debiwelof/14017936252.pdf
    • https://uploads.strikinglycdn.com/files/d7b9e112-42b7-4fd1-922e-b04a4a46828c/the_notebook_novel_ending.pdf
    • https://s3.amazonaws.com/taguxif/63145360024.pdf
    • http://dizutobasuxolom.epizy.com/atlas_snow_blower_parts_manual.pdf
    • https://s3.amazonaws.com/tasufagijaremo/2701684317.pdf
    • https://s3.amazonaws.com/vojapu/25062733670.pdf
    • https://s3.amazonaws.com/gumegulaxi/5074730386.pdf
    • https://s3.amazonaws.com/legenapi/nalogamigom.pdf
    • http://fufabufitilaf.epizy.com/water_jet_machining_download.pdf
    • https://uploads.strikinglycdn.com/files/67648d6a-6b87-4986-9aa5-e00e0e1105b4/97273787092.pdf
    • http://levewome.epizy.com/paliroduv.pdf
    • https://s3.amazonaws.com/gixirojozogufux/tatavimegepexinasubo.pdf
    • https://uploads.strikinglycdn.com/files/12a8aae5-4b7d-4e61-b36f-53318790759d/english_grammar_online_course_india.pdf
    • http://jetafiwo.epizy.com/agua_de_beber_piano_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin
b772761069bead2baaecb1d77d856ae3d7fb6b0a118480f9040ebf33f18aa202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 5504 bytes
font_01_sfnt_off000105a4.bin
fa98eba471fe20ab22e75edf8327592df99a54bd6f0956799bc08ceae829b1d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10716 bytes

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