Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e567406e773df5f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 04:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b56ca7a3781f58d63f0652d2b46ce01e SHA-1: ef5caec267457585b5ab802f8c684bc17d656ab7 SHA-256: 4e567406e773df5f5293aeb40d0c1b0d23694a34c93d474f6bcbe9d499fffb87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external URIs strongly indicate it's used as a lure to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pieseclimaauto.com/files/file/98593522528.pdf In PDF document text
    • https://mongolia-volkslift.com/uploads/files/89454250621.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/59107610239.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/ruwozarobaritilazogima.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910083140.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/zavolif.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/suralifepobizedawo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/49410550314.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/86699333567.pdfIn PDF document text
    • http://sinners-party.de/media/file/3707468741.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bujeb.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/texomixabakeraretivu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/64855824236.pdfIn PDF document text
    • https://magatek.com/documents/file/5966606594.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nunaribuzopitijumolaw.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/28141017596.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/pozikurasugo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/12849201528.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/rapofowabuzi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c04e389e---jeriwoxaruvelofenon.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/68891598345.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/biwufet.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/tulomexexekogowikev.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/juxakovogesazesuvepiwepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=thgss+tv+apkPDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 24140 bytes
SHA-256: 7c94588d9202983aed93d5420114929a766a81911b35f3f0f1cf8af983a4016a
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 10056 bytes
SHA-256: b51a45f540647176c16ffa2a2749b80d7b183258e5a0ff00680d02603f4a6770

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