Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bc6d020d910eaf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe1361d86e6d8a1e35f890cdef1f24dd SHA-1: 1cdcb83d15f113dd076fcb79a84b6e730d1ca6c9 SHA-256: e7bc6d020d910eaf665155334de59b0833522454a8a3089dc037e6cd11218ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://herve-coiffure.ci/files/wopobazobaginisorerebuno.pdf In PDF document text
    • https://hohsingfiber.com/ufiles/files/duzowegaj.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/fijoresaxagigoreduw.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/zulufavafiwufiwigiviko.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/fepakivuwirodojegabati.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/57977713888.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/81987112425.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/27790332455.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/ditigogas.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/9980871598.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/nisopixusuw.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fabupidobebifugopat.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/fepuze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6527afc4---42162197458.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kufodapagobitoropujefije.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/82343016114.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
    • http://charontrade.hu/data/file/gewudiri.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kipeminariwusutufekamat.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/13417681075.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/vasamo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/801cb3651c130251551209318affb9ac/muxuterakuxakexiluz.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/zegujovefogaretirifejofoz.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jajitewatasenolatarezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=transfer+contacts+from+old+phone+to+new+phone+androidPDF 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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16936 bytes
SHA-256: a1df438e99949cfe3f697d1e5961b07d7d8b72e02deded57c99e7840cbfb8ba0
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10932 bytes
SHA-256: 49798a86cfad5eded9629c8577c45f4f79dc546d528ef8be3f9dc7312c15a069

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