Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69c68e6b782c516…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 18:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c67b8283219653881324b3eb7889790e SHA-1: 3e26f35da97d99a04cfbc436c420b785c0229678 SHA-256: c69c68e6b782c516897bfa8286d5bae9863a0795e5dcaf1c29593e96af068b7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including one pointing to 'infrive.ru' with a 'find my lost redmi phone' UTM term, suggesting a phishing lure. The PDF's structure and the presence of many distinct, low-link-count external URLs indicate it functions as a link farm, likely redirecting users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=find+my+lost+redmi+phone PDF link annotation
    • https://igescanada.com/ckfinder/userfiles/files/90491978864.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/wuxefelekojexebebibevuxe.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/24484311169.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/757900072.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/benukovatelimababal.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ae90ki32r7fflrh6thaij2r0es/36519655017.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/96058033249.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300774dda---kovisumurupuguriw.pdfIn PDF document text
    • http://zuche0551.com/upload/file/51624827271.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/44732652872.pdfIn PDF document text
    • http://proxima-design.cz/files/file/tanifunijubonogudex.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/nikigowofowivud.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/67337687406.pdfIn PDF document text
    • http://martonelektro.hu/files/file/60817539021.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/23912570034.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuxolelasuvot.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/23809547605.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/30150554597.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zonupafoberaxusi.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xigusikejodunulapado.pdfIn PDF document text
    • http://amandamaitland.com/images/file/67242550054.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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 17860 bytes
SHA-256: 4eadd40364055865445231613a430b10202b224a112cd8bcbf1041726356633f
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10588 bytes
SHA-256: 9785a1b07db7046647c7c72b26942d4b2ebcceafb915747c78c38857e6e64ca4

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