Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fa0ffa9a13e510…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 12:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0058be3c7212b5be9e6e3581ef1d7d08 SHA-1: 61d8abe24c97c22dccb39f229affe9a5584940c6 SHA-256: 53fa0ffa9a13e510bd3f8eaf603fcf71cb0a24e1d6d7ee1782c381b6a3cde89c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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 URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=use+your+phone+as+a+webcam+via+usb PDF link annotation
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/8212997608.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/2916603880.pdfIn PDF document text
    • https://projetovm.com/uploads/files/48470350918.pdfIn PDF document text
    • https://venus-forever.com/image/files/kusegef.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/68074281414.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/2049857084.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907161300.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/83880379968.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/76568849156.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/gemolefuluroxugalilazibos.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/31011168745.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b0360b30ed09f1bf8b6dbf2709db050/3051023476.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7f1c26baf9bac6b77abf3f6db27441be/71882372143.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/64425050196.pdfIn PDF document text
    • https://t2sc.me/userfiles/juwojorelawasezon.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tepeforikax.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/65096146035.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/10601307083.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/38775761932.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/61558317267.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zejitisadevosu.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/12905172602.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xofepasubelumuxubevujasi.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/68885772535.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/mawarasupajebabid.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_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 11008 bytes
SHA-256: c8a9733815ecc36ab0f8826109953b05f735046df89054ff0bc7a61965f2b26a
font_01_sfnt_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 14620 bytes
SHA-256: 7631ca0607211197be563743b9890a3dbf9e875cd168a0d804ff9747292df9f7
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1