Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db8c06d0b40da12…

MALICIOUS

PDF

71.8 KB Created: 2021-04-12 21:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7bbf1d7beae5bc54a2d1271dc0803f2e SHA-1: db3975e3a07a0ab338c43fac0306760faeca846e SHA-256: 6db8c06d0b40da125dd086d103186c2224acaa198a833124533245092a9634f0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://seumenha.ru/strik?utm_term=how+to+eat+fried+worms+full+movie+putlockers', are likely used to redirect users to malicious content or phishing pages.

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://seumenha.ru/strik?utm_term=how+to+eat+fried+worms+full+movie+putlockers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483097/normal_6038fad586f40.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/59909056906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_6035de0251c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_60503937e95c4.pdfIn PDF document text
    • http://vlada4.xyz/hoverboard_in_store_pick_upentpt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6049ac5a3481b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fcea40b6fe35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_603c5e5e27e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6061438777c12.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/36613097132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fcc809b70b8b.pdfIn PDF document text
    • http://want-seo.ru/pimodifoluddgq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_600d6118ca254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd2e126a0fa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalijoruki.atwebpages.com/the_aryavarta_chronicles_free_download.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_229c32d3743c46ccaf91e154bc6fcaec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/99651273813.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/seweliwupipemo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/bogotabazarotimemosabeb.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/fc_barcelona_wallpaper_hd_for_android.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_4921f0e93b1b451d9be31830dc87a42e.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_a778fdaffb95497ea4bf24fb2db5f529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/36568803522.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_78f4687d236c4bf98e76752ca8f7daa5.pdf?index=trueIn 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 5480 bytes
SHA-256: 43ef14dfcb205fc3cf088d8e16c8cbfffca0b4f83ed398848507dd98887f3a04
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10376 bytes
SHA-256: 35d4daa9de24de741f58e74c47aac008ab84983006ce92721b7e5e7726d2ad68