Malicious PDF — malware analysis report

Static analysis result for SHA-256 5283223467ffd713…

MALICIOUS

PDF

75.7 KB Created: 2021-03-16 07:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab488fed6410f3500d2f4e2cbf7e4cce SHA-1: 1da8d01d4692876764a47c531435df1d162d6e53 SHA-256: 5283223467ffd713cc7edf1425dcd2ea9c766c3ec1d005a842108092ef7c50d7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=math+expressions+grade+1+volume+2+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601ba7b6219a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_601571a857c04.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/90824229103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_600c014ca0e40.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/8480809.pdfIn PDF document text
    • https://zaroralovez.weebly.com/uploads/1/3/0/8/130814195/bukivove_natafafazef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_6041e5bce1e2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5fdc990dd2a98.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/rixoxixavowexajuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5fcd353b57e17.pdfIn PDF document text
    • https://zosixilerav.weebly.com/uploads/1/3/1/8/131856356/torajatu-bezuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_60368299855fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63e79591b8.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/masibogudabobiwazimafotap.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/5ba525fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ponekoj.epizy.com/calendrio_do_mundial_2020_portugal.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/dotimaz.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/ridgid_miter_saw_stand_review.pdfIn PDF document text
    • http://modedavap.epizy.com/pert_chart_critical_path_template.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/pediatric_advanced_life_support_study_guide.pdfIn PDF document text
    • http://lemujiv.epizy.com/jewodo.pdfIn PDF document text
    • http://zagasazibizit.epizy.com/63063735855.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/tatigefidazulenogago.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/how_to_link_dish_remote_with_tv.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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5948 bytes
SHA-256: 33b195fa13c0756daaf1d90eb9591994d17183d7ec40cf3550afd291051352e1
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 11044 bytes
SHA-256: d80a9f1198af6ea12f8cfdc1714338103bedc18841ac8fea64c8b44aa3d4c5b5