Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a24af124823734…

MALICIOUS

PDF

97.5 KB Created: 2021-09-14 21:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4527d7d85e64890176f80dc0ff58f660 SHA-1: 273e22ad0f860155013bf27792d81ef1be3ecb2e SHA-256: 14a24af1248237344d6ba47143402d7419d285d3234a5348a959d591255eb3a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a coordinated effort to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=impacto+de+las+tic+en+la+sociedad+pdf PDF link annotation
    • http://studionegro.net/userfiles/files/zejofajeregifeva.pdfIn PDF document text
    • http://pneusmarene.it/images/file/61395804234.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/72072974037.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/riroxebet.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/gedelutusobivugilokon.pdfIn PDF document text
    • http://altus.pl/userfiles/file/33726515384.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/movoronirijixapatibamif.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64618337704.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/76693343477.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/802087948.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/5213649819.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/dosajoxekusuvapusuvo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vulakekovima.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5c9e7139---sexuzap.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/pakevumozin.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xuveravokexitinepaxafasoj.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/pawafidujavizaxe.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/71853270377.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/ginevonuvabep.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/6639746003.pdfIn PDF document text
    • http://leguido.net/files/24083837629.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/xukubufagosapesaboxodafik.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/84571674255.pdfIn PDF document text
    • http://ave-france.com/pics/files/wunetametojawulokotalimok.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_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 19904 bytes
SHA-256: 2d98c92726b6b101b53b3573d44a12f3cb245d488a38c123cf1e153f2c9663b4
font_01_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 10632 bytes
SHA-256: d84d5019c8c90d19efe5f709e87cadeb2c8782cf68adcf848ebff376b295acf1
font_02_sfnt_off00016001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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