Malicious PDF — malware analysis report

Static analysis result for SHA-256 167dedcce6451118…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 00:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67520636f490e1a0d81a11916be2f3e1 SHA-1: 353a342e37bc3c52c4ea3c1f228117dd441eed61 SHA-256: 167dedcce6451118ced1d18fc029b9358bf8cb6a9766bcd8de5093236134efb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

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 https://kompaspt2.com/contents/files/bivepuzatapode.pdf In PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/37120040899.pdfIn PDF document text
    • http://status.cz/UserFiles/File/94560508636.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/dugom.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613305f0a1cc8---9144869233.pdfIn PDF document text
    • http://le383.com/uploads/files/88031204810.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/38429978024.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fdbfg52vr6osfb8k4rmuailoqf/vabaritusazetima.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/pexepopajopom.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/miweridizosavapunapela.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/tuwirolipilapadipirep.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/80407484208.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/41087363123.pdfIn PDF document text
    • https://fobh.net/userfiles/files/96722905445.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51567689092.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/77615866987.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kojanumipesudivunogelodud.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jimafakofomukibisa.pdfIn PDF document text
    • http://packamate.com/userfiles/48085649261.pdfIn PDF document text
    • https://halkum.rs/files/zilaf.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/8425433386.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/buleb.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/wasuredepevivijinuxipuzi.pdfIn PDF document text
    • https://fptica.ru/images/file/nexetoginufe.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/81224018600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+instagram+auto+commentPDF 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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 17528 bytes
SHA-256: 7ab5168b9c718e3026ad71a1a4c8c28fff93725748d868d89d09da2b249cf15e
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10604 bytes
SHA-256: a52f27f0065c5d753387bb44fee98138e0c4af4f2d271a9d40c063ed8a7563cc
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1