Malicious PDF — malware analysis report

Static analysis result for SHA-256 775cb09fef39ac00…

MALICIOUS

PDF

94.4 KB Created: 2021-03-29 04:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90325b770c811abe69d4254ab4d8f2f1 SHA-1: 10794dfcb8aae6eb2a7604da374d98fc31754310 SHA-256: 775cb09fef39ac0084c762bda8aa3e0cbc190e932ce71b174d5d8bb0c6d9c5e8
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains text that could be interpreted as a lure related to 'world building guide books'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=best+world+building+guide+books
    • https://cdn-cms.f-static.net/uploads/4452612/normal_602a513cd3fec.pdf
    • https://static.s123-cdn-static.com/uploads/4385030/normal_5feb6dab1743f.pdf
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5ff8497e1ad83.pdf
    • https://cdn-cms.f-static.net/uploads/4447107/normal_6052460f45b2d.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_60540ab93fd5a.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_5fd88166da6bf.pdf
    • https://cdn.sqhk.co/pulijidapis/jbH5Ge4/13906047654.pdf
    • http://wezotodatixazu.iblogger.org/online_story_books_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fd8f5238c4e2.pdf
    • https://cdn.sqhk.co/rosisole/c78gOgg/81064536341.pdf
    • https://cdn.sqhk.co/xiladuxe/yynTyjd/hoverboard_stunts_2016.pdf
    • https://cdn.sqhk.co/pilimisoduk/ijIgfpv/health_and_nutrition_degree.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_601305f249824.pdf
    • https://cdn-cms.f-static.net/uploads/4488855/normal_603ebfd67d342.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6030937da3f0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://padekapekalerel.rf.gd/53218368523.pdf
    • https://uploads.strikinglycdn.com/files/35cec295-0e46-4611-aec2-0de30160ade3/femunififaxipakire.pdf
    • http://diroxowevigem.epizy.com/favesutowojuzipeza.pdf
    • http://kuwetokapuvawe.epizy.com/acidosis_metabolica_sintomas.pdf
    • https://s3.amazonaws.com/wetowuzuxit/adobe_flash_professional_bagas31.pdf
    • https://uploads.strikinglycdn.com/files/f1521391-7693-40d8-9035-775704c09023/garmin_gns_650_xi.pdf
    • https://uploads.strikinglycdn.com/files/acb96f45-f595-4d91-ae99-dd91db893cc0/ge_pension_buyout_phone_number.pdf
    • https://s3.amazonaws.com/gogunabones/bottle_feeding_guidelines_nhs.pdf
    • http://muropij.epizy.com/biodata_format_for_bank_job.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_off0001331d.bin
1ec5f35dd34890773bcc60adad4677bfaef17409ae278636bb8be121b0b6989f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 5128 bytes
font_01_sfnt_off000144b5.bin
7767bf307783eb060cc6409766429bb48784e82a6ca63d18d4936f2b793ffabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144B5 11840 bytes

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