Malicious PDF — malware analysis report

Static analysis result for SHA-256 8696d0b6811fade3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 13:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17754c1bf2f0eed3f595aa9c0baa6d08 SHA-1: af8237a4f9ec09183204e997bd8200150d5e8732 SHA-256: 8696d0b6811fade31065d448f5ded093afd8a608ef105331accaa38b61df7b53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8d92451a---28178350051.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/gebiwagebulugifu.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/panilujimevoxuro.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fazufixujilodojexilu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913180724.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/nasijowepimaxonobawad.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/68206227093.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/82996477994.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/vakelukokapof.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jixukokasewexen.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/37854140618.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wafikugagexekosaje.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45561897986.pdfIn PDF document text
    • http://getdol.com/page_data/file/75929437726.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/63597198561.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/63773129843.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/goforitupanizadonevu.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/fozovuk.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/lerofutivap.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dubebozujajatezak.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6c4c475c0fd58772984434f7bc46c364/92488017194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=male+gametophyte+in+angiosperms+producesPDF 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 11168 bytes
SHA-256: 8bcad1eb990c6170e561c1e15560396f0b2157167969ac2699243f987a8890f0
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16996 bytes
SHA-256: c45c7ddca258ad5aaee3ddbf8694f5b2f12092cd7c7393acea785cda4c915dd0
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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