Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f71cd551ad0cffc…

MALICIOUS

PDF

94.8 KB Created: 2021-09-18 22:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bd798479be6be24c26d6957c19b4669 SHA-1: 0978f150ddd91f97256773ad755036867b1f4652 SHA-256: 2f71cd551ad0cffc59dee0fca0013a68eabf7c4d44a41e949a44cc338d320a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://etyekilovarda.hu/userfiles/file/xegopo.pdf In PDF document text
    • http://energy-labels.nl/userfiles/file/30229614798.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jebigizasifofoxuj.pdfIn PDF document text
    • http://patroha.hu/file/vivapusenitamizenuwuti.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/56880409568.pdfIn PDF document text
    • http://househouse.it/userfiles/files/7229829904.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wibekesologafufonagizifom.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/linikikomibolejeresi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/63720315409.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/15869340466.pdfIn PDF document text
    • http://mega.kz/media/upload/files/40312507899.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/33mtnmkcq6b8nv2kqplbakhpdc/loxexo.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/towulusijigasifono.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/sobinipezonuxidetevofasa.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/ponuwe.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1082528989.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/64521668806.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kotivawup.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jobidawepadabeb.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wezin.pdfIn PDF document text
    • https://laser123.com/geektic/files/56856922915.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358449c2432---12999988390.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/39260319462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ff7+strategy+guide+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_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 10644 bytes
SHA-256: b9f9ddba4cd56056b6a87f6b54d150a9fab00a225d9641b1f2d83593e398130a
font_02_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 18208 bytes
SHA-256: 3c8d769d5e9645d094d367ee0eca3e2d50e77f88f5a31c89905d0a0e277af6fa