Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fea52fc3731ad0d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 04:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3d2fec86ed6c24c22e3520ab7aa12de SHA-1: 270cd6bd104253a752936f87e0f9a1ec153f9003 SHA-256: 1fea52fc3731ad0db81f637b5c948003227da955567c9722fd06c1605cea7d91
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://atdawnwelift.com/userfiles/file/megitezigudukovurik.pdf In PDF document text
    • https://proia.bg/userfiles/file/80743956095.pdfIn PDF document text
    • http://wawa757.com/uploads/files/79772982781.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wuvebow.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/57837447760.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kaxotinidamanevuxe.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_5BD742B1DD90B3AA.pdfIn PDF document text
    • http://prestopc.it/upload/file/15422209436.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/nakojafadubagasububug.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161487710ec7fd---muzulefixunalavezo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee42888633---23961740803.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/13161394679.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/14009523276.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/24365359328.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/lagovaw.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/fetexewimojopitej.pdfIn PDF document text
    • http://glassick.com/userfiles/file/65874902944.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/guwazoretet.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/52696810805.pdfIn PDF document text
    • http://bamor.org/userfiles/file/supumelutigup.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22437241056.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/38899127527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=last+names+that+sound+like+first+namesPDF 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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 10768 bytes
SHA-256: 0d057770eda8812709278526648c6b510e86c99e04c9659520bda676373336cc
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 16672 bytes
SHA-256: 0575d1eacdc307a9e0b580e637fca926d862bde117741cccfdeea3bcaea4b83a