Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa53660b16289de3…

MALICIOUS

PDF

80.1 KB Created: 2021-02-21 03:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c4ed025822b747d83555dff6e935aabb SHA-1: ab32091ec090e61901790380d9fc7cc8c9a5ff7b SHA-256: aa53660b16289de3a253ae73d92d0d0c26a55fcff197f0f1c860c7e8a3d6f796
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://jottigo.ru/strik?utm_term=what+is+5c+code+on+samsung+washer', is presented as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

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 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.
  • 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://jottigo.ru/strik?utm_term=what+is+5c+code+on+samsung+washer PDF link annotation
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/1032236.pdfIn PDF document text
    • https://sokijaxojo.weebly.com/uploads/1/3/5/4/135400829/01a8f945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_602daec97d375.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/fakalu.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/zulubakamexoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602264c4a6bb6.pdfIn PDF document text
    • http://matirimekege.22web.org/handwriting_analysis_forensic_evidence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_602b8a9fecdce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fdc0b66ebbfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/dowuziv.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/2657953137.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/balenciaga_reporter_crossbody_review.pdfIn PDF document text
    • http://niruzozokaki.epizy.com/how_to_change_pin_code_on_genie_garage_door_opener.pdfIn PDF document text
    • http://reditab.epizy.com/vebazanar.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/myocardial_infarction_coding_guidelines_2018.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/utility_trailer_bill_of_sale_template_ontario.pdfIn PDF document text
    • http://bonizeza.epizy.com/inventory_management_report_sample.pdfIn PDF document text
    • http://sazexuxezife.rf.gd/vudafofijenirajibamas.pdfIn PDF document text
    • http://wubogijogazerew.epizy.com/lagu_blackpink_whistle_live.pdfIn PDF document text
    • http://riremeg.rf.gd/walmart_financial_statements_2018.pdfIn PDF document text
    • http://vabuperupijod.epizy.com/acute_sensorineural_hearing_loss_guidelines.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_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 5552 bytes
SHA-256: a87e7759b3a722639da019aec096bebef846eb4ab27a60fa2c5406ba26aca5bc
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10872 bytes
SHA-256: fde2ada48648ae81a116dc6fa4e4b877b2a9b805351ba00da889a5efc70072f4

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