Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59d331aa9d6ea81…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 14:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1618c7d8902898e0fbae89609a4aff7 SHA-1: 28df31a1eaec40266b1d7fb9fcd2cf6131399dad SHA-256: e59d331aa9d6ea8147a8121f2f0e867a5bfc1c7b2e521865608f353e3b3474c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to distribute links across disposable hosting. The primary attack pattern involves luring users to click on these links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://isystem.hu/userfiles/file/52566230368.pdf In PDF document text
    • http://airelimpio.mx/img/editor/file/38079099710.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/24525776693.pdfIn PDF document text
    • https://adikketiga.com/contents/files/ravomozovom.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210925_DF9E32B97181CC19.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/letuz.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/13069420703.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/93535926011.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/92093947044.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/tutamibeduzaler.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/nalumezuliramojoso.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/dosokegaxadubenulirisota.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/gavulezofizegafoxudofivu.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/53411306449.pdfIn PDF document text
    • https://losungversorger.com/product/file/zotumomitutunovikoguxusup.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/vugugiwixukupenatekerad.pdfIn PDF document text
    • http://hk-keber.de/images/file/28033647862.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/sezazekagogaxopa.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/64930176382.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/17110997137.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pokusibenabol.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/gafoxediwapirofiwitide.pdfIn PDF document text
    • https://grnca.org/img/files/files/13360974988.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/35893152259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=modal+should+examplesPDF 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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 10460 bytes
SHA-256: c1ea8f12ac4310cfbb26120448f53654895f46ede698c79cb0609314c1dc2617
font_02_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16452 bytes
SHA-256: 51ead0142a5c51c1e92b864bf4607d2897745503e0fa5982eeb2b992e1d95f9f

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