Malicious PDF — malware analysis report

Static analysis result for SHA-256 809cd208b6c51cd1…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 09:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05829ab42ff194428a63980f83276e1f SHA-1: 58bb57cec064c34fc720409a08bb955d772d9fcf SHA-256: 809cd208b6c51cd1c1361f110e5c945f6e9147be671ec9dc410b0bd3253165ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9992

Heuristics 5

  • 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://fokemale.ru/strik?utm_term=realidades+2+capitulo+5a-3+guided+practice+answers PDF link annotation
    • http://salestore.pro/923159505844f745.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/mixasadevepamcs8co.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/reruzarexuwe.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/niwusawikudosugefewavikoo8jbt.pdfIn PDF document text
    • https://tuxotise.weebly.com/uploads/1/3/1/3/131379496/9122711.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/broken_spears.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_6019f1ccb73f1.pdfIn PDF document text
    • http://de-bewertung-889562.icu/fejopololubenuzateri75peg.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/c4b254b7aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_605580a21b3b6.pdfIn PDF document text
    • https://nomiviweran.weebly.com/uploads/1/3/1/0/131070579/kagakazibifin-sijamepujalok.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/nutumubajupeb.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/7368369427.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/4227792.pdfIn PDF document text
    • http://reduslimitalia-official.site/zoxebaxidc7r6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurofanosikuga.atwebpages.com/55597250855.pdfIn PDF document text
    • http://gixufedexakav.atwebpages.com/magisterium_tome_1_gratuit.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_436439d1a7604335960f2ddf2d596e68.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_ce0f6a6b9a6547bfa5bfe823012a5ca7.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7f240dfa05b0455e9adffce2c189eeea.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_a5e49adaafe1402fafeee3d3de89f639.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcbaa56-5ce8-432d-a8fd-d495e02ce772/ways_to_celebrate_graduation_during_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b377fd-e635-4bfa-aad5-20e9e728d29c/zosafonufavudave.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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5792 bytes
SHA-256: 63b70fc89eb29eb1a0c7274d9db8173867532ca1b52f18d27736f51ca842c9b9
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 11192 bytes
SHA-256: eba1110e1d92f3c60d0ee1ca167d4b61a3cc4d3d5552da5f87bf2807e16e4b7f