Malicious PDF — malware analysis report

Static analysis result for SHA-256 52344dc3a7eed39e…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 16:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b852aa4cbdf2f0803a208725056a7920 SHA-1: 17f9281876a55feb353fe4ba399e42f6414203cf SHA-256: 52344dc3a7eed39ec89b704b898c640b5ab3fea8aac744d9464aab57d98de7eb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=2013+jeep+grand+cherokee+overland+v8+towing+capacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374366/normal_60246ce612a90.pdfIn PDF document text
    • http://koreanluxe.com/starfall_i_m_reading_apk9vjvv.pdfIn PDF document text
    • http://serdyukov.pro/my_wyze_plug_won_t_connectifsnf.pdfIn PDF document text
    • http://alisabor.design/24074543388zxo6t.pdfIn PDF document text
    • http://persequen.com/tojagojamokuxowejifuzz3lt.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/la_metamorfosis_sinopsis_del_librosusf4.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/66449336464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_5fd3204cd11a7.pdfIn PDF document text
    • http://rukozhop-guide.com/what_perfume_smells_like_beautifullweoe.pdfIn PDF document text
    • http://trujillostacoshop.com/tupivokuremaziss7ch5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fedabb59e14c.pdfIn PDF document text
    • http://natiral.space/22018007101xg3f1.pdfIn PDF document text
    • http://leledup.mypressonline.com/carreras_universidad_del_valle_buga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_604a2f955e64f.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/zagomewopifewuwo.pdfIn PDF document text
    • http://laithub.pro/ford_explorer_2002_xlt97piy.pdfIn PDF document text
    • http://goproits.com/whirlpool_wher25_filter_change1pd6x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5ff9656134e79.pdfIn PDF document text
    • http://giftcard-sale.store/95542339865yecg8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesufonezis.epizy.com/sozufesiwigezava.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/professional_soccer_weight_training_programs.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_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 6140 bytes
SHA-256: ac37c94e525cebfcea801770884073c5b39a31af66dee340ba3529ee90a4a85c
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 11108 bytes
SHA-256: 2682c7db34c5f3c125ff3382e360e2260133c11840b80e4dd3c728d3b6624a34

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