Malicious PDF — malware analysis report

Static analysis result for SHA-256 41630aa704086ae0…

MALICIOUS

PDF

104.9 KB Created: 2021-10-06 05:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30757a0d675b3ea2492a30b95fe36674 SHA-1: ad54c1ba589fa0100f364037fb60f79e13995859 SHA-256: 41630aa704086ae0bc02b73b41d6e51666683937b7f11e945f2c6ac44be744b4
126 Risk Score

Malware Insights

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

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 likely attempt to direct users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to serve as a deceptive gateway.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=kant%27s+grounding+for+the+metaphysics+of+morals PDF link annotation
    • http://av72-reklama.ru/userfiles/file/163158352540477bc2adceef4d2c90.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/51266662341.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/benimumepifuda.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bedowodexa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/viferowowimaluvafesifot.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/xotetonidapuxomalavufawo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xelez.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/65438852738.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_4FD0BA4FE5A4B3E0.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/73073011222.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/badagepedevujevewun.pdfIn PDF document text
    • https://kiptep.ru/file/vanamajizujorowotozesov.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021102212256.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_12936_565.pdfIn PDF document text
    • https://22importexport.com/eimages/file/78113286400.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/55433803895.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/xewepojizali.pdfIn PDF document text
    • https://jensbrode.de/files/file/4853123286.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/gibatanidefibufodovaliwa.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/topesinaxabexik.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/bigosowokifomufud.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/zitovamurituvovap.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/77a510b41047e25842c5a0f172441bc1/delisofulovuvezikibuzis.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_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14861 11308 bytes
SHA-256: 180d9d576ee8f3626ee6e21326d6cbab2d294662c909d405f54ade9151103712
font_02_sfnt_off0001629d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629D 19768 bytes
SHA-256: 076abdab5fcddf56d4b59b65bf4315a800e0d35d8473506cfb53137292ab25f2