Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0958190f870247…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 09:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 957143f812cad0cb1d655d856bbf4417 SHA-1: 01abd368f7bb68a6a7584450c570dd4695630688 SHA-256: da0958190f870247efe9ad5b5389fee1f6d41ea678cd103bee3ec862d846e451
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=redmi+9c+nfc+firmware PDF link annotation
    • http://flirtproducties.nl/ckfinder/userfiles/files/mojumilowexojoduwowesogox.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95333916770.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210910152724.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/75314761875.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/jojupozokipumi.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/sorojewa.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jozixen.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lujoxaveraxedetabasuw.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/fanovizisekajifel.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/30244462452.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/98693389161.pdfIn PDF document text
    • http://w-mill.jp/images/file/82872104988.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tomomumima.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed589ea643---34096708339.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/xosurugigogav.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/75343148201.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/55574595812.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/wapunopumesupaxozira.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/wuxetoviterowoso.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/68894857019.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/48071917850.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/kovuv.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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 17768 bytes
SHA-256: e77a34371b469a806d53cf7a93fc4671bb9749d3cda0d0dd6eb2a92d1d7d262f
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 10504 bytes
SHA-256: 0756a1a1abf27d631ed4bcc9c33f063f0855551d0bf992ad87c98643ea354342

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