Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c6bae096f15bd2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-25 13:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a437c9f45af95326454c1c5099240fc5 SHA-1: 3adc8aeb731307219072514f7768294844cb14f5 SHA-256: e6c6bae096f15bd277a46b5089483ceb79e58d594e0e31a6ce8a5a048155dbcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links suggests the PDF is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=pokemon+go+no+coins+from+gym PDF link annotation
    • https://xlspandoek.nl/userfiles/file/88749096557.pdfIn PDF document text
    • http://skene.es/userfiles/file/20448543788.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/xojibitaku.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/44920423097.pdfIn PDF document text
    • https://kenadong.com/contents/files/91427041070.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/gilujobiwonusenal.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/gixulosali.pdfIn PDF document text
    • http://beijingteye.com/upload/files/rozumoxofixipenujapubabel.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/45479510072.pdfIn PDF document text
    • http://boki.hu/editor_up/45751005565.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • http://safarang.com/basefile/files/fuvawekagapu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/72907110954.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/78039906994.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/lulisojinupobesok.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306253710c6---56986807677.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/87401692874.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gugefobunu.pdfIn PDF document text
    • 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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 10580 bytes
SHA-256: 8a574780a8345eb6e6bf5e6ec0d5d73fc62068c1395f589c7826802fdba01129
font_02_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 18728 bytes
SHA-256: 81da9207227799e8311eab43c8ef4bbc656b2b95cf460e12fc0f2712af6b36c9

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