Malicious PDF — malware analysis report

Static analysis result for SHA-256 513e43d20242cbf0…

MALICIOUS

PDF

76.1 KB Created: 2021-02-06 01:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ea1627847e1e26013ddf45461abc80d SHA-1: c504defdb2f2b3227cabad15212ae829891fec7b SHA-256: 513e43d20242cbf0b4e5d70fd539991b363036323583281cb1d61580f9daf2d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 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://maypoin.ru/123?utm_term=uml+domain+model+vs+class+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5ff1dc9b018c8.pdfIn PDF document text
    • http://lesantyqas.online/20886074948c6ytp.pdfIn PDF document text
    • https://gizumefelaz.weebly.com/uploads/1/3/4/3/134318195/dedoro_zakikotekomosid.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/fobisawalamogeri.pdfIn PDF document text
    • http://busibear.com/zaxavixewotokamatisurozivhouh2.pdfIn PDF document text
    • http://todayit.pro/tivevariximfont4.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/posilijesuwo.pdfIn PDF document text
    • http://podipotekoi.ru/one_clue_crossword_answers_word_of_the_daygag7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5ff7d812b818f.pdfIn PDF document text
    • http://vemasujananexu.22web.org/house_of_cards_season_3_cast_reporter.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/fisod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5fc5b3be7a90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_600dad7983a87.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/e1HvQPW/amex_gift_card_cash_app.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/9735470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393186/normal_5ffab1541e89a.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/eNfgc7T/stay_alert_stay_safe_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizibapuzaduxe.epizy.com/10460685736.pdfIn PDF document text
    • http://burijudipo.epizy.com/adobe_afterlight_free.pdfIn PDF document text
    • http://dubabin.rf.gd/ledutibebesal.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5308 bytes
SHA-256: 466b56b47c3547448cb607c272a9a26719d5ee00a5080448186bcaf5a9877417
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10628 bytes
SHA-256: 62fe335bbf8a13f35beb2a13f32938d5a2ba22124a47ddcf1150dca824298829

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