Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4007c7d1cdc42ea…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 13:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33ebcc8754fcc9ec332b0917d42766cd SHA-1: a23ba48d105fea815848f114bac2cb85e9a2079c SHA-256: d4007c7d1cdc42ea405de6fea67833f63aadcf6c261c8637cc1912356e3e7f38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://avrig35.ro/uploads/fck_editor/file/gigilerufawizoxem.pdf In PDF document text
    • http://qiuyutv.com/userfiles/files/20210905114904.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xodubujigerabokemujitiro.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/61288767411.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/14388255849.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jikonopugiguzujadapatoku.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/98702866121.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/borowofogiribajunipo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa2b3e139---mozapekotofili.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/xuteligavugo.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bevabebinew.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/86824251671.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/6796995467.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c93ac2646---20617561647.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/36211487748.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/41376868166.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/dexudogemutowogutodo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/niduvokomokonikuwozevuzu.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wuxapejubanasesox.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/nimudawi.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/jusujixifabebugetopo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28436208622.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xiwijuradape.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/sasupuxamuzigigulu.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/5219308422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=downloading+ios+apps+on+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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 10424 bytes
SHA-256: 983053124096771a79d4bfce3e36b1da23546f36eff958e41e6d5e73c6815867
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 18944 bytes
SHA-256: 2002b50026ef9df010470c55d539a8547dca1ff236439a7c30f25f3c9e62bdda