Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d810c4e047aa6…

MALICIOUS

PDF

80.6 KB Created: 2021-10-12 13:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d9ae15453934bf001abebc577e67d35b SHA-1: 75459326f485f5933ed1338dbfdf386dc95a27bb SHA-256: e99d810c4e047aa647d0975b652c3e9d50c6e630ca53ffe58aa9fde8bd47e904
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://permargi.com/files/galeria/files/xibezifinipure.pdf In PDF document text
    • https://dottoridegregorio.it/public/file/66003702040.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nodomejamevinovod.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/49867148396.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/75099208693.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/boxizudoxowoxibimid.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/83768254416.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/64598167500.pdfIn PDF document text
    • http://arablift.net/userfiles/file/50544392012.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/pagifaxutiz.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/zajadajapawapo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16160b23ec42d8---bipesanebeputojawusalita.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/saxapubibuvevosevamiw.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/domedumo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/wefad.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/8234920781.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/97664376062.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/zogumixomozomapigirovodo.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/kipigegusefena.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nemudulu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9f6fe1bf2742f43c6eb4192e8cd1cb22/79708586636.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/28663820421.pdfIn PDF document text
    • https://sapporopools.com/contents/files/muxevus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=the+roofbox+companyPDF 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 19480 bytes
SHA-256: a462adf84a52e93cf388e95089f20bcd76df6219f69aad14fe4d1aef0ba7c858
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 10660 bytes
SHA-256: a1e7c623216c68939a5a66b2930aecf8380aa9f27c2c1394b6bb37dbf9a6259d
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1