Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c93e32761e90668…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 16:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89f0ffe868fd5172866a0bf63a8e553b SHA-1: 4c38ac2a069ac2437a2041b56cf7e15b409414fa SHA-256: 3c93e32761e906686cdac3f8593e0c2143f997e5033ef5e07fc8b175350c95a4
126 Risk Score

Malware Insights

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

The file was detected 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 disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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 https://makanbanyak.net/contents/files/nisewipogesitejesipase.pdf In PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630874874.pdfIn PDF document text
    • https://emenu.hu/editor_up/zikitazowesewejeta.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zuzikibadoxixupemakin.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a0f960d8---43364008070.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/61466879933.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/5461101387.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lunomusunowikeruxogufade.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/5445846242.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/4274049454.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/sudugawolisifoku.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/1670495739.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/65155240323.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/63699729458.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/goxanoxalazavadepilo.pdfIn PDF document text
    • http://generoussecurity.com/uploads/gazafoles.pdfIn PDF document text
    • http://yuli-china.ru/d/files/guwafotapozusojibi.pdfIn PDF document text
    • https://arendic.cl/files/kibewazi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/matitimanuwosu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/rejut.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xivawuxopinujepizujexikuv.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33101553474.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/91072393570.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/furiwixudene.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111f33140c---86430224667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=create+a+multi+page+pdf+in+photoshopPDF 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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 18092 bytes
SHA-256: 24a095da0758787295b2c38e1992f2fb7186d2b3f963a858eb5b92afef28b69c
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 11076 bytes
SHA-256: c585b2a949765364dc378677c2250b35218bb77d750cf5325f724c3216a0bb60
font_02_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1