Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c092d29b8625066…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 11:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9a430f9f06353fe36ec21bd1ae7e03b SHA-1: 9bc476bd23f3b7b8cd38bf7186226516b51fa79e SHA-256: 0c092d29b862506680a29f58c502ead698051533227ab2c33de2910ffbbf8962
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://inwebjor.ru/uplcv?utm_term=harry+potter+ebook+free+download+for+iphone PDF link annotation
    • http://sunnyten.net/userData/board/file/43596348352.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/73288540600.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zujijejiwubovenokipilu.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021092103503873499.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/93044065741.pdfIn PDF document text
    • https://aodaixuan.com/app/webroot/upload/image/files/gegaxusejusad.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/safapaxisov.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/92088707316.pdfIn PDF document text
    • http://bndweb.nl/upload/files/medunesowo.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/panelege.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/nanimesurosuf.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/mozavelotosev.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/sikitafunezojametanebe.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vimudemuwuvexaruxopilo.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/ravopixowewikevolimiriz.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/78277585349.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/36427770880.pdfIn PDF document text
    • http://superbarter.sk/media/file/dazomejizej.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/53350356144.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138358c0be04---bifezebafusafonip.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/79152201800.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421f4646984---lopatanuwizegejanuxogam.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fuvegajazude.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • http://cga82.com/admin/File/62164617868.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210903001104898.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_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 14716 bytes
SHA-256: 22d2793f0d1c43eaedce214ee16f077d34dc3e4649f778c7405e88a040c2d670
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 10848 bytes
SHA-256: a70315e26fdfb0242bc2d9b03601209e51dac85e80f58a774886dae8e1ec3260
font_02_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1