Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f3260dc2f9455…

MALICIOUS

PDF

72.7 KB Created: 2021-04-03 16:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b59ec40203cf7d3566bccd3f5f7be92 SHA-1: 2cff27cc5b594b856e9b80e2c323eb475ad66691 SHA-256: 663f3260dc2f94553e0ce060f9adb3c5ac0666eaafc3f17d3646106b13b42dbd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to PDF files, suggests a link farm or redirection mechanism. ClamAV also detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=sub+zero+611+f+manual
    • http://teplotronic.ru/65849974154rrphl.pdf
    • https://static.s123-cdn-static.com/uploads/4449793/normal_6004cc76a8136.pdf
    • http://tivuximuliku.mygamesonline.org/puzakofagonaverase.pdf
    • http://digtalcaliper09.xyz/lista_de_las_parabolas_de_jesus_en_los_evangeliosee33q.pdf
    • http://parkingtest.xyz/780890579710x4xw.pdf
    • http://zuregazezoral.mygamesonline.org/concrete_admixture_seminar.pdf
    • http://magusawatason.22web.org/genie_2_status_lights.pdf
    • http://pop-marketplace.ru/mugijodieqfmw.pdf
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fcb9dd6b1282.pdf
    • http://bozesedixek.mywebcommunity.org/86554352564.pdf
    • http://kafemefiturokuk.22web.org/zewonuxetobofatorazubo.pdf
    • http://copyrighthelpbusiness.net/el_negocio_del_siglo_21_resumen_capitulo_4myiv7.pdf
    • http://sodowetan.mywebcommunity.org/kulozawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_72c2e6e7287f47a2ac1a90167481abd6.pdf?index=true
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_ab93f7a83b544a959ab8548f8abded7f.pdf?index=true
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_01b7bc3cbf654804b87b9e861a5f3d5c.pdf?index=true
    • http://rusesav.rf.gd/lepakirukasenup.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_11e3d1f106f64ed080ff7c7c4c96f713.pdf?index=true
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_de0901e4e0c1450aa3921fe510567e29.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_208ed5c4aba849a0a39e1becf2d650d7.pdf?index=true
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c5bf18c07a2d4d08ac9472baa72a2bee.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_70ef021e653540afa5ca8c5cb6b0b38e.pdf?index=true
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_a120eb0bba3442bfaa62ce839bf3c8f9.pdf?index=true
    • http://fipodumogom.epizy.com/secured_party_creditor_process.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_off0000df70.bin
3f81195a02b225e774ea488c2a97adad6d1e820102c58772abcc6578a1d0d0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 5232 bytes
font_01_sfnt_off0000f135.bin
621ed359c38830b43f8725ccdbad04c5f42d9984de6f63c31a5740ac75a73cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 10692 bytes

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