Malicious PDF — malware analysis report

Static analysis result for SHA-256 805d8cf658781dde…

MALICIOUS

PDF

96.3 KB Created: 2021-09-19 04:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88bb6f566d9ba49098624dac8f266d9a SHA-1: 5987106e0987550a07c2d36f86574a59fe72b80a SHA-256: 805d8cf658781dde0801541adb788e6ba071a638c875d7d63578d1224efe3f98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=365+days+streaming PDF link annotation
    • https://aviseco.ro/userfiles/file/43422765356.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/bolajokex.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/48580315774.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/duxope.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_CBB6715A136E58B8.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/85249015187.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/1475460286.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/resomerugolivijumovoge.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/91617688086.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/filafunigajolazukadudus.pdfIn PDF document text
    • http://dakov.hu/_user/file/sufejogitopuv.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/sapodafarazuwizekujivi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5b3280aa59c32f8cc1ad951dee19e497/26556095441.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/temididina.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/83004141575.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/65669483936.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/bibajudub.pdfIn PDF document text
    • http://edituj.cz/res/file/83040934534.pdfIn PDF document text
    • http://logicamail.it/draft/media/bonixodokagetidope.pdfIn PDF document text
    • https://shibbirs.com/media/files/62760066106.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/ledusakikebeme.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wedavonowesubulig.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6178928572.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/44865946075.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_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10916 bytes
SHA-256: bcea84257ae4005224429bafb2f922cc5ce4d21d9f2d24e6da01675bd7ff0ace
font_01_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 19704 bytes
SHA-256: 3b3312b01068853c04ae28556d5cf7178d964f40a294673842d0fc33786fd51d

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