Malicious PDF — malware analysis report

Static analysis result for SHA-256 b659c415032eec54…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 10:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d3bcdb338edb95f630febca12097879f SHA-1: 6b3fa74f1c1d1e059f4031de8e81d4d7db5c8a2f SHA-256: b659c415032eec54729d7afd70fea730f60dd4a3c85273583b9dc51d8f46d318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. 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 URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=android+to+pc+cast PDF link annotation
    • http://absolutelyneon.com/userfiles/file/68005020586.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/kefekileratasa.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/16574916710.pdfIn PDF document text
    • https://pellevah.com/upload/files/53852863333.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/1657846024.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soripijoxinu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/lorekulam.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/kobaxaditevejufoxuvojozep.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/99668721088.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xaketesenam.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tumigevofar.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/jefoxivoxiwatubirojifox.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/85511263779.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/34709560131.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/11517926165.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210915_170807.pdfIn PDF document text
    • https://aksusu.com/upload/files/soxepapipabuw.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xopoxavene.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/tumusasu.pdfIn PDF document text
    • https://thietbigas.net/media/files/fosoxojaf.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_off0000b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 10308 bytes
SHA-256: 12890748c48425aebd5eb9fc99c9a7b8f446ea2004bd69e3654409c117bc1a09
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17244 bytes
SHA-256: 64353d194e766055c1c5f15319f5489dcc5c696caa29f4171ae7ba7f46a051fa
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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