Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29696fdc4639cc9…

MALICIOUS

PDF

68.2 KB Created: 2021-09-21 03:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 943e5e49b9c0846e18cdbc39c514b7c2 SHA-1: 9e91370d927a863cdb3f03a0c5b0843e44767dbc SHA-256: f29696fdc4639cc9e1a57ca31d7bd4a4a9a776483f9e972028faccd7d22b4e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document's structure as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://timandlor.com/userfiles/file/29818812385.pdf In PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/moregikelerakesasowuvuz.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/10032696038.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44611854146.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/jinifelidanawobudop.pdfIn PDF document text
    • http://hotechike.com/files/files/10010045781.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lurifu.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_F04FCBDE3DC3E481.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/15067605756.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/loxoxixalobij.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/peguzujalisofegivi.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/22809636428.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36809471148.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4eabg7n3uf8psq8hedb9htmncl/guvida.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/mosuzikav.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908005955.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/kejutebijawedapivufatesa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/98210067849.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17caeb13d---susuvixazemotaxag.pdfIn PDF document text
    • https://peterdegendt.be/file/gexapivogulubuvev.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/lireloremelosawuvupipeb.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/34892428000.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/96072022460.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wibotusilaviwimaxikivuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+noise+meterPDF 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_off0000af7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 14820 bytes
SHA-256: 19f5153b980243bd6cdebc7dcf388d7f34389b2ef3883102f0b8544bbbfef1ee
font_02_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10184 bytes
SHA-256: 01b8e8eda54f31fce149e91840a8169766c36dbd66e6f0722c9c8f97417c8e72