Malicious PDF — malware analysis report

Static analysis result for SHA-256 71439026c0748f20…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dd3881cb1c164d8429a8ab9b10e70a3 SHA-1: 2ba7d4542927f7850dee0b0d92a3fadcfb320db4 SHA-256: 71439026c0748f20c9f15c3bc59acb42f1af477658b5a7608f2c141fdadc62a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, often used to obscure the true destination or to distribute phishing content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hmradiatoriai.lt/images/files/73677220813.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/pijisopazomiwosovurixido.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/sewabuk.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/61420692715.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/56573810557.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090114040673499.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/64298577800.pdfIn PDF document text
    • http://aven.su/userfiles/file/22964708809.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140903c9e4c7---92038013788.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/dugulivomafebojetujitije.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/somanodujogivedilovasax.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fawaxetalanisimatekap.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/gadusojozubojuvulufusug.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gorebigejepazutusasonarig.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/95972169568.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/pujagifufu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/93759213552.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985fbe2e4---66918378757.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/72561274841.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/23991852040.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/vunexezabewur.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/86960368434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wolverine+workout+pdfPDF 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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10496 bytes
SHA-256: cbdbf8677e870f5c133dcf62fa43faca49c2789a92b38337cd48a15c8fc8fefc
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 17812 bytes
SHA-256: 4faadeab7515de25c039c7bd2798ebb701802c2bbe6aedd4d7fa0033d5e2b8e2

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