Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7f6e25411c2f3c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 09:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bcefc6cc49a75b86b5448b89f5487cd SHA-1: af4a2b8f188864f4925803cffcc3bbaaed3e041d SHA-256: bc7f6e25411c2f3c5e94248f9afe0cc4523d327f7c0c96c0a35ee1cab95caf79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://catamma.ru/uplcv?utm_term=remini+app+mod+apk PDF link annotation
    • http://www.ocptecnology.com/admin/uploaded/fck/file/mamumifajuditifut.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8c2fbde9a---82088573983.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/43144190514.pdfIn PDF document text
    • http://baove247.org/upload/files/4537051223.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xofen.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/daluxufogizuvebugas.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/zibidalosikopabas.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/jelotabefewamunej.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
    • http://cpviettin.com/upload/files/joxukelutugimizoguseve.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wumofolomolim.pdfIn PDF document text
    • https://curvy.tw/upload/files/45493421238.pdfIn PDF document text
    • https://matratva.in/userfiles/file/pasozaxasug.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nekida.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/32471699666.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/wolazarepunotafoponi.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902075329366.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/worakax.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/86818767436.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/93016127907.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/tapubusakogajexiv.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/72051441852.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1ec18cb---jutikazeseralewane.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/lukenogajaruzewika.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/95399557830.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 17700 bytes
SHA-256: 87fc3b3e7ab22bfef265019694e9017bd4893a0602685bfa3f2cf6dee5a66849
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 10280 bytes
SHA-256: 6ffa03944263d6df0cf2af3dd5237627f6097eb44e36beaebd458cd879a8fc3f
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1