Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e7ced839f17839…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 07:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3022bd221f321dfc9286cac36a0d7aeb SHA-1: 505d79ed607cb2fcf74ab254903fc36f94cde84f SHA-256: e4e7ced839f1783941dbeffa8b8d6cdbc234ead0ec7c55f851fd36aad515144c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'kuzutuzo.ru', suggesting a redirection or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=calories+in+dunkin+donuts+frozen+coffee+with+skim+milk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485696/normal_600598da476d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fe00087016f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5feb4f6bae172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd33a054a715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fc7e872d9f7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457281/normal_5feb836dcbc98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musokejixami/32150401689.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_7d9905a30ea04f929e57655d0c76fb73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb61918d-3f8e-4444-b0a5-b16fd22ac4c1/do_swiffer_wet_jets_need_batteries.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a446cea761e840cd9e87369164117d93.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_31c972f7abf340bbb8ae1b4949cad587.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b7ac5-372e-46b7-bbb6-796f6a816634/good_canon_camera_for_video.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_2c401851a62140da9d1676997c9768b8.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_8cc6ff866ebf40ccbba9f0ce4dbdefdf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/forms_of_identity_for_employment.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/27249654676.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/appendix_1_36_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4218e6-d1db-4b55-8790-a0e9e890873b/1000_funny_jokes.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_2a2ec9ed2c89417e926bb06b2669975f.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_c714fd2e5bba476e91f02c083b751a63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/75448978557.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_b22ce79987d34ff98e703079e12f7906.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_05f16a9d4c2c4f01afd79cbd369e05f4.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5372 bytes
SHA-256: 282455e042403dc1e384c3fe14cfdf9b38c01ebaf43685a2a844a588968fc6e9
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 14788 bytes
SHA-256: 68570c2dccae7430ac2ef121b4f4845a5587615b3d53138867511bddc37113ae