Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e17a04c9788df6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 12:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6977c18f1cfef2ca469db6fdd0af84a2 SHA-1: e71df11aba14707e2874cd5172c45d4b3926e76b SHA-256: 75e17a04c9788df65751094ddf1c47e460815020b206d5050038c09f59d40d71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are suspicious. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest 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 http://aquaclub.hu/userfiles/file/73459909906.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/65220333345.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/memegeduzixok.pdfIn PDF document text
    • https://conrays.ru/f/data/19942198783.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bipeluvuvapitinipuverute.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4c61b40195279da31641f128195b320b/reman.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/gexerewi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/86505192680.pdfIn PDF document text
    • http://vititanon.com/user_img/files/moguvimewuze.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/95976549053.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b181ac631b562fbc4fbd3e23e14699e5/96335946369.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/boxakozezaz.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/sowusugaxubira.pdfIn PDF document text
    • http://synphabase.ch/upload/file/rijopuzezefuwatare.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/retosezaw.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lutigagasutago.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/nisaxe.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/puxojiniwoniwovewowekuz.pdfIn PDF document text
    • http://jfe.hk/userfiles/xorakibepibotebelijaxolab.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kelawunexobag.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210906003220_7ug6wd.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/57475387347.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/zelotisudiv.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/87651601768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+tetris+unblockedPDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10512 bytes
SHA-256: d14bf8df4e6fb50a4ad15a042b0dab08a91d2004d0b2a20642c56646913fc551
font_02_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 17484 bytes
SHA-256: d46d96579860f54472dc5cc67f2dda6588750eb69469b406c48c60c6e5e57388

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