Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f37b33e0f2cae4f…

MALICIOUS

PDF

120.5 KB Created: 2021-05-04 02:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b0cb6c80e956e239303aa6c94bcfac90 SHA-1: 80dfd41a48002f5d2d906dfc4df4cc7d7b1d45d4 SHA-256: 7f37b33e0f2cae4f8a6f70384f516bc8c324c84322217001db1c7329582c0d4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign-looking PDF files, suggesting a link farm for SEO manipulation. One of the primary URLs, 'https://kuzutuzo.ru/strik?utm_term=program+arduino+pro+mini+with+uno+smd', is flagged as unknown and is likely part of the malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/strik?utm_term=program+arduino+pro+mini+with+uno+smd PDF link annotation
    • http://kilijosizujowo.medianewsonline.com/xujol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_5fde392c7222d.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/expertise_in_nursing_practice.pdfIn PDF document text
    • http://xezodisezimado.iblogger.org/apa_references_format_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_6019d51aceeb7.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/at-lp120_usb_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5febf095d8ea3.pdfIn PDF document text
    • http://livopazumifena.iblogger.org/xevewaxudixomi.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/safusaxabaxuporiso.pdfIn PDF document text
    • http://bedusopuzal.22web.org/il_libro_di_abramelin.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/xisefowu/casio_illuminator_manual_3140.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/gemisonadubonuwefakaze.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/what_is_the_easiest_audio_recording_software_to_use.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_a5c9a56195134cb087bb3e0529942cfd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/54725818089.pdfIn PDF document text
    • http://wivegetozedogal.epizy.com/semojuzudadupipitojawadir.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_1513d3529532476e914fb0fa2fc29fef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/princeton_review_sat_subject_test_chemistry_prep_17th_edition.pdfIn PDF document text
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_9712aba9d8c749d59bd74d532c2e7b13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/mofokinix.pdfIn PDF document text
    • http://vuxepogi.atwebpages.com/ketakejumi.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/lelenusulozuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/xokawemurejobenali.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/99906007920.pdfIn PDF document text
    • http://wobemiko.epizy.com/gartner_iot_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/zogafeluzemivetozitora.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A3 10868 bytes
SHA-256: b053fe40a0b16a6f1d6fd6de2db5823ad850e8154cb520a2cfd3d58b8ac91aaa
font_01_sfnt_off00019359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19359 5432 bytes
SHA-256: 1cb8fb7673a6fa74d7539ffdf4c64fc920a094ba46010cb935ac3c2814e55e04
font_02_sfnt_off0001a5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5B6 14460 bytes
SHA-256: b3706a6ec81a336479aafcfa647a2f3030fb99acd5f0e520805fc4cff9429ef7

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