Malicious PDF — malware analysis report

Static analysis result for SHA-256 4423d373d5141fb2…

MALICIOUS

PDF

82.8 KB Created: 2021-04-09 12:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae447b3f31078ba0fcdadb1414e789f9 SHA-1: 275902db9eb53b31b213495ffd472f639551b33e SHA-256: 4423d373d5141fb287716cdf50d76f0f97c6381aad4e1cfba263cd217ea9d4cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. The presence of a large number of external links, including one pointing to 'resalured.ru', suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the heuristic 'PDF_SEO_LINK_FARM' indicate a campaign to generate traffic or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+does+a+leo+man+test+you
    • https://cdn-cms.f-static.net/uploads/4486061/normal_604ee94db7746.pdf
    • https://cdn-cms.f-static.net/uploads/4483345/normal_606c9b39623cb.pdf
    • https://cdn.sqhk.co/jujejorule/BhbjhlI/300561541.pdf
    • https://cdn.sqhk.co/tegatiwuwax/dhigmXt/kudoxipovurarebabubebuz.pdf
    • https://cdn.sqhk.co/kulobibab/idhhxZy/gibufoneresun.pdf
    • https://cdn.sqhk.co/savunowudob/jjghkfu/korasofemuxoresuzawoxejo.pdf
    • https://cdn.sqhk.co/tewokozogop/JZrhggi/fowideduxinujomaxolegej.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_605dc36eacb24.pdf
    • https://cdn-cms.f-static.net/uploads/4426257/normal_600dd06763383.pdf
    • https://cdn.sqhk.co/muvotugi/ibjiifY/sakura_school_simulator_1._035._17.pdf
    • https://cdn-cms.f-static.net/uploads/4387589/normal_600a3d7ca62f0.pdf
    • https://cdn.sqhk.co/nomavunut/E7sCjh2/icd_10_code_bilateral_thoracic_outlet_syndrome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paropabaru/is_taco_bell_good_to_eat.pdf
    • https://s3.amazonaws.com/jotogorurekuro/birla_institute_of_technology_noida_admission_form.pdf
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_3c45f543a5344d2abd347a8b8b47a9e0.pdf?index=true
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_3974fa74807c4b2689b9318dacdf7e7f.pdf?index=true
    • https://s3.amazonaws.com/gawabog/sullair_375_compressor_service_manual.pdf
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_7a4f1e3f5d394fb8a55154f407f40fde.pdf?index=true
    • https://s3.amazonaws.com/fulosobezur/47036652575.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/zaledowuratixovatafodi.pdf
    • https://s3.amazonaws.com/muxozuvalubi/zisajudusod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010780.bin
4689358abbda6433039248f3200ac38373e707c5fdc1c888f5fd1b4ef17f6462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 5028 bytes
font_01_sfnt_off000118a0.bin
7666121499258bb4f46138e1dd0b0997f2ee5e524f0fc01e039cdc1d7076892f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 10764 bytes

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