Malicious PDF — malware analysis report

Static analysis result for SHA-256 2646aea1bf2ee428…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 13:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 824b7df1202cd5f40ed8bcb194912d18 SHA-1: d46ce5cf845a013307d2d139cf7012ddaaf084bb SHA-256: 2646aea1bf2ee4282a160a38d4e42e4473f846d960cdfefbe27a252e513fcdef
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'botokaw.ru', which is likely the primary lure. The PDF structure and embedded content suggest an attempt to disguise malicious intent, possibly by masquerading as a legitimate document to trick users into visiting the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://botokaw.ru/wix?keyword=simplify+radicals+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427781/normal_600adcbcb1d9b.pdfIn PDF document text
    • http://trenketo.buzz/gavewokezelijamisozenup5s0q7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_60257c71b471f.pdfIn PDF document text
    • http://copriyghtconfirmed.com/eso_master_angler_boatb51tj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_60595a2f17c94.pdfIn PDF document text
    • http://hookup153.site/87938444454n18uc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/988946e8-7c76-4eaa-9010-4f244cd86f75/62039026480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f226c12-2be1-42e6-aaf3-ca7d7f59c696/71960371135.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_fe705e6102b149d9823fe78ebf50dd59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/subagugatexonavepo.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_d627274a7bd640e1a0544bbf2ce7e61f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/tifumaru.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_435c82b8a57f4a4e9375e01e9a41da8f.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_40a61757609b429eb61618f525d5e06a.pdf?index=trueIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_0ecb75c2df354999939cafdcf83758ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a148b088-dd99-4172-80ff-ae2f552b8eca/blues_guitar_scales_for_beginners.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_ff1d4eea108b4d29899f573d2a53f9c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/adobe_indesign_cs6_free_softonic.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_ac11808301dc4a62aa5ead45f556aeb3.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 5756 bytes
SHA-256: 179405f9f8c8845275572642b83bb836d0e52263543d43d54cb0bc48494c5fbf
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 11072 bytes
SHA-256: 808cb2c2edde2fdbede6ba59473d78e11b3e8ec84f6dde921a380fea355d25a0

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