Malicious PDF — malware analysis report

Static analysis result for SHA-256 381651f3674a62b3…

MALICIOUS

PDF

76.0 KB Created: 2021-02-25 15:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d073ecb02bd30e472f7b9c5daf83df0 SHA-1: c028591a208264dd6b19292c58b40fcd74014cd3 SHA-256: 381651f3674a62b3b3afd1217e6dd041ccbaa0d0f4fce986de4089af205a5a2a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or link farm attack, indicated by numerous external links, including invisible links to a CAPTCHA-themed lure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=parts+of+speech+flipbook+pdf PDF link annotation
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/6472626.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/251926.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/somuzijef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5fe01d794a1cf.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/3127696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5fdf0f24ce42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_603063b49d64c.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/299cf57e6228.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/7472775.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/2416925.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/woposobif.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/tufitijinexu/full_form_of_mla_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/bukukowupewulosuvemot.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/aeroporto_malpensa_ufficio_informazioni_telefono.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/worker_captchatypers_forms_login.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/igmh_lab_reports.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 5448 bytes
SHA-256: 33e4fb186308c6b71f0094c785ee8327af10029159b5d005f3ec801085d3221a
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10348 bytes
SHA-256: 85b78598c5acf77a5cce95d3fa14eed1b9d194d2570039aba0bb599085e313d1

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