Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8a98e947fe3165…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 09:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b06e6966eb9afe4ae1b297b9b4302c0 SHA-1: 9ebbc73b412094839d96219121ab65859cb26824 SHA-256: 2e8a98e947fe3165dd7dd21dc4ecbd051ae0b111eb3e62fc26958257b97aad81
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and ML classifier output strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic reveals a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of embedded URLs and the link farm structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://praguynakorn.com/praguynakorn/picture/datapro/files/rewedonu.pdf In PDF document text
    • http://sahrugs.com/userfiles/file/zixorefibazit.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/tebasalod.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/1827102786.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/24371779792.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vobawojedeleg.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/26093369298.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/93394024163.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/6069289820.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/pirakoj.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/dixezisemivapitero.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/54809847269.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/97932907700.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/rurebodagikewodibag.pdfIn PDF document text
    • https://mihalex.by/files/files/gufoxezesabututipozusek.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365afdc725d---21689250387.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/fefabar.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/2307020504.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/42158059127.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/10944835476.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98141390837.pdfIn PDF document text
    • http://apothepharma.com/upload/files/risokofexulegapexotuk.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/8341279661.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/gewexawubivux.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/79688572316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=transfer+wifi+passwords+from+android+to+iphonePDF link annotation
    • 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17400 bytes
SHA-256: 97360a277d941a53466a52c3a6cc7fb98f57b05624e4ce17df98b1a2bc3dace9
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 10764 bytes
SHA-256: 975e47b671490eae1aa2d064116ab23479be803907f9b04bc0a7169f1dfdc748