Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdc99bc5e5fe9b3…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 12:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da587e702db4189343f8d61723194285 SHA-1: d1229a928669b6bfe0d9efe0bd4b1e5fa18f4e69 SHA-256: 4cdc99bc5e5fe9b376d6281ba9777d477c6edef51b48c9625c9fab9feaa2a9c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=clash+of+lights+apk+download+unlimited+troops PDF link annotation
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/zumuju.pdfIn PDF document text
    • http://zalavsky.ru/agenda_docente_2019_argentina4ev5h.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/f3843411fb431d6.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/parliamentary_form_of_government_ppt3nwtn.pdfIn PDF document text
    • https://pofuzopabo.weebly.com/uploads/1/3/4/3/134307265/rasiragosikatelewe.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/lonimevo.pdfIn PDF document text
    • http://newser.site/how_to_write_a_bakery_business_proposalzmm90.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/favorowupi-bekosaj-niwuju.pdfIn PDF document text
    • http://gebovoxitim.22web.org/85003376435.pdfIn PDF document text
    • https://pumagawiluzade.weebly.com/uploads/1/3/4/6/134697536/dowojaw-sugidodikige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozemuki.rf.gd/libro_las_claviculas_del_rey_salomon.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/batman_joker_comics.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/41935306531.pdfIn PDF document text
    • http://kiduxoz.epizy.com/32673835246.pdfIn PDF document text
    • http://genufewewirim.rf.gd/sample_promissory_note_philippine_legal_forms.pdfIn PDF document text
    • http://kuparego.rf.gd/4th_grade_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/keto_meal_planner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/valiant_force_building_guide_2017.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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5516 bytes
SHA-256: 7c32f5d7f89b51e091c0078505aaf8e4c3d449ae5d5e7ca8ebff5f44d8d3920f
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 10368 bytes
SHA-256: 98854870eba71017ebc2553456f44f4d7b6436700f8f71ab6e1cffb02a9b98be

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