Malicious PDF — malware analysis report

Static analysis result for SHA-256 547d99e801008413…

MALICIOUS

PDF

73.9 KB Created: 2021-03-18 00:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8d1d81d06403bf15fb69400f77afecce SHA-1: f23488526898ce24927301390e379ad2a4aa1a8e SHA-256: 547d99e801008413c48a48435b91357684b3fb6b256f708803b2517909f8196d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One of the extracted URLs, https://bologen.ru/wb?keyword=what%20does%20leaving%20early%20mean%20for%20uk, appears to be part of this scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose beyond the link farm.

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://bologen.ru/wb?keyword=what%20does%20leaving%20early%20mean%20for%20uk PDF link annotation
    • http://true-board1.club/meteripedusizofijoxh4zl.pdfIn PDF document text
    • http://openchambre.xyz/download_film_thailand_my_little_princes_sub_indokxdby.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/kopulex-nudulupusig-gapenufipudid.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/32108512751.pdfIn PDF document text
    • https://wexireseveta.weebly.com/uploads/1/3/4/3/134338560/6121282.pdfIn PDF document text
    • https://damesijegimu.weebly.com/uploads/1/3/4/6/134624484/dedetelexupo_givotujitiwiwe_fubasepajuzej_kasexemip.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/17746437859.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/8466598.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/romira.pdfIn PDF document text
    • http://promoocaoameericanas.com/68969463443nw9kh.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/fekotegove.pdfIn PDF document text
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/7740477.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/95734532111.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/dotolupibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ridurosumebo.epizy.com/44538926315.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/98619893946.pdfIn PDF document text
    • http://linopiziv.epizy.com/sevutasorudujupemu.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/25737023181.pdfIn PDF document text
    • http://dajajubofu.rf.gd/citizen_mens_eco_drive_promaster_navihawk_watch_cb5841-05e.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5560 bytes
SHA-256: d6cd3275cb8df2912f13ba025c73f30773648fa2f1253b9650abf97509606403
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 9944 bytes
SHA-256: 38b11ada34a7f3e7be7253ee3572396691fb490053fac2bd04dc93a2234462bb

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