Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c5eb2abbd8a939…

MALICIOUS

PDF

83.5 KB Created: 2021-02-16 12:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b2fd1de5982eb2db1f2cf42e529d6b73 SHA-1: eea8544398ade0b194edb113259e7a13d7944785 SHA-256: a3c5eb2abbd8a93923707bd39831ad685bb37773c2db844e178af9c17deef167
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 point to potentially malicious domains or are part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=how+to+put+laundry+detergent+in+speed+queen+washer PDF link annotation
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/bc6f76a.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/BBMjdgs/why_isnt_the_turbo_card_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/ghh5e4n/jageneditisaloradodu.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/43cf52.pdfIn PDF document text
    • http://trycabinets.xyz/mipajonevuzivjjtkh.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RRUcYBO/93826090285.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/iUXNl3X/25951486200.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/wumupojelefib_kajokaj_xotigesuxotalib_tizaro.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/dd48f4d6b.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/wusigipufuvowix/85679295236.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/3704414032.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/evh_5150_iii_50w_el34_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/mufuselijexobavakujetow.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/8951067069.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/66103390525.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/21487945851.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/91182370307.pdfIn PDF document text
    • http://rifavewo.epizy.com/neramajogesexagem.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_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 5500 bytes
SHA-256: 4ec29e8430e07db41ed8fa68e37f09a54be6c9ebc14cf5247d3953af60f13e1d
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 11196 bytes
SHA-256: 100bd1e23963b5b866d7de317047ec3c0cab0c27e958beb44345bfb079f542cd

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