Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b5d7660f2051c5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 01:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3295e7fa72fb01227793b8a61d25f4a SHA-1: 55feb3738701f47994a5c4b9a4e80fb7b5a66ef0 SHA-256: 31b5d7660f2051c52d0ae5739b2b82a566b6f6617f25610a801e136c6a0931e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=how+to+make+neon+purple PDF link annotation
    • https://amursvoidom.ru/media/files/fesovakuzaziwu.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/61815041442.pdfIn PDF document text
    • https://ckmandarin.com/uploads/rogoradonufe.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/28676407222.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/48590917762.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/4963020430.pdfIn PDF document text
    • http://toroisg.com/public/images/files/29069996245.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/zalilebawi.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/podavuzebamewusimugizub.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/70514636432.pdfIn PDF document text
    • http://avistravel.ro/userfiles/file/jazezijumovejifog.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lbrg8ibth2nrftilvhg8vsk56n/fumijo.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/57563926631.pdfIn PDF document text
    • https://rjpexport.com/files/31110250978.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/somijamiwojepisupulupa.pdfIn PDF document text
    • http://teachatapollo.com/file/pupivu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tiximame.pdfIn PDF document text
    • http://tano-cable.com/d/files/7949631849.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40692547349.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/bikemoxami.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c0622b96bb9e8de107ec61e074f21638/72013148467.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/jagapiburibezugogowolelo.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/51840056611.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22429312814.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/46573668506.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_off0000b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB804 10420 bytes
SHA-256: 649b4bd41174a4e769d9e83873dc2de128012b89286ff559f3ec00ee631242de
font_01_sfnt_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 17788 bytes
SHA-256: 59a166e91460c86c0c6e57b6dd4afb679cf59c1a66658b30c8de10858246e1b4
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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