Malicious PDF — malware analysis report

Static analysis result for SHA-256 96db6d418bf762ea…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 22:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c85d1abc3b68742577aa253d1c22d5a SHA-1: 0c1565a1ad11773bb1b9ffea1f9e9a6ec7e97510 SHA-256: 96db6d418bf762eaa09a7f3d8fc9edf19e1648a7e2694bfff548f0abb9ef23de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the suspicious URL, which is a common tactic for phishing or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bjhtdszdh.com/v15/Upload/file/202196858388865.pdf In PDF document text
    • http://mobilahomedesign.com/userfiles/files/tunonubavujazomidukow.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/selukaxifiner.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/janufafanugozitizasol.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/puzaxepitekibikazakazila.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/30038721886.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/67270634735.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/lepozafugimajirogiz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c311a41c6---9669553856.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/jamoga.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/11724948489.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/74386019136.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/daziwadalanebojot.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37262366225.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/wabazifu.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/79226310090.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/29012676940.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/59788233351.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/89797047843.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/waverap.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/dofovuvujotomixoxonanew.pdfIn PDF document text
    • http://methese.com/upload/files/84703752638.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/4433992155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mockup+tablette+androidPDF 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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 18488 bytes
SHA-256: 8c80c1b259273b7e5d5d60e78b244db37b32c2e612b571ec2aac5a3bcd3dc5a7
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10664 bytes
SHA-256: 85be29315d78218aa251875a0518a23442a50e9ebecb4f9a07210949e38701d3
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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