Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8ba53c3b3e44d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 12:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0ac5012c81480ed24744dd7e2f68179 SHA-1: 68bbc551037e2d0ea164d9b0a1fcf2236fa78583 SHA-256: 7bf8ba53c3b3e44df0abd1d1065a13b75bd9820de0dfcf35d62c7aabe4a69e05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to facilitate access to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=android+set+activity+background+transparent+programmatically PDF link annotation
    • http://nc-israel.ru/upload/files/78322329566.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zavogavuzatefinudujoligov.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sopatosakar.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jozofafije.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/18485745974.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba4a44.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/mekagajelexitiwuti.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/74502920569.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/nimufadunufoxegilutewuw.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/38197279929.pdfIn PDF document text
    • http://hiniceshine.com/upload/fuzovajatar.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/mijuzejiminepilomapej.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030255432334.pdfIn PDF document text
    • https://razredna-nastava.net/files/zukegeligudepos.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/81311140062.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/tarapuzatirosagezaf.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totemidekevefegad.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/54864131001.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/katasugofa.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/banupojonapete.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1314a451---26753161731.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bidekege.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/57748709745.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mup907u8fbfq9lcg8ir9jh422/81051348036.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/83061701345.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 16348 bytes
SHA-256: e53ad98560b14aed6b38e8db095f25c58921db6b9f2687943b2f781e4f045ac4
font_01_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 11352 bytes
SHA-256: 79bf5b492f591580d599befbbc7db3ec3e7bfc65de95655efdf2e7d3eaf0b90d
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1