Malicious PDF — malware analysis report

Static analysis result for SHA-256 532d20974eec5b30…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 18:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81c767925caba32bc3f14a3103850a2d SHA-1: d9905ce2ba1cc0b5eb0b5996c8a31522dc869783 SHA-256: 532d20974eec5b3091ccc425169e719971781569fda29ce28673af4094520d17
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=bescherelle+grammaire+anglaise+pdf
    • http://laserisesiseno.getenjoyment.net/all_about_the_holy_spirit.pdf
    • http://avlto.best/dyson_absolute_dc17_animal_how_to_usef70ro.pdf
    • https://tujuwofaxeg.weebly.com/uploads/1/3/2/8/132814826/kezipotupuv-denuxaz-zepolunizuwana.pdf
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/653296.pdf
    • http://vevaroda.scienceontheweb.net/40861323416.pdf
    • http://giftcard-sale.store/experimental_design_biology_answerskfek2.pdf
    • http://lebepufu.mypressonline.com/kcet_previous_years_solved_papers.pdf
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/07833bf16bb.pdf
    • http://instapriz.website/midnight_sun_part_2_read_onlineur4od.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9e46c13812104e828eba076321c1bee8.pdf?index=true
    • https://s3.amazonaws.com/joterige/gerod.pdf
    • http://sanojepenot.onlinewebshop.net/understanding_the_linux_kernel_3rd_edition.pdf
    • https://s3.amazonaws.com/rawesaragegugar/conception_2_conversation_guide.pdf
    • http://kexomun.myartsonline.com/difabejupibijijif.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_246d50211b0f44b6be34e5b1ac94da6e.pdf?index=true
    • https://s3.amazonaws.com/patotale/24279971517.pdf
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_4b666655f98048288477ba463bc7e69f.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_8dff99c2865b4f599d2ba169ff52d487.pdf?index=true
    • https://s3.amazonaws.com/zafaronivaj/senujise.pdf
    • https://s3.amazonaws.com/remuv/kapugizukaj.pdf
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_b6aeddfbbfd54a699ab6c1f156c45a30.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74c.bin
67076bfdd6098d931213a026478d52dfbdfb983d5f2aa07f5483992e531ecb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 5216 bytes
font_01_sfnt_off0000e8d6.bin
3fd9f275becdc292e571bec60afc1501cd65088b7d98c469dbbb055e783e9232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 12732 bytes
font_02_sfnt_off00011100.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 4324 bytes

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