Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b8cd0d67365fb3…

MALICIOUS

PDF

74.4 KB Created: 2021-02-19 12:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8c6f39a49697a9b29edf8d2fd314f9c2 SHA-1: 42cc0aa92db44b53666efa0b843b6dfdf5400060 SHA-256: 83b8cd0d67365fb32fc99614c7335f192d60ad17b43222813294dc4748d749f7
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URL, https://jottigo.ru/wix?keyword=portia+achievement+guide, which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'Portia achievement guide'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jottigo.ru/wix?keyword=portia+achievement+guide PDF link annotation
    • https://cdn.sqhk.co/posebozej/FicwVjc/2021_oscar_contenders_best_actress.pdfIn PDF document text
    • http://xusolupofedowi.iblogger.org/15410838220.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/cUKhcrj/kavevi.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/agcEgdk/booyah_meme_roblox_id.pdfIn PDF document text
    • http://afracheat6.xyz/cash_voucher_templatez5y3r.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/dhfjHaA/android_change_my_voicemail_password.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/c4qjdia/tambourine_instrument_category.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pusevim.epizy.com/weather_report_cda_id.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/builder_design_pattern_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/karolujudana.pdfIn PDF document text
    • http://zutavifefif.epizy.com/xetomiposiwizarib.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 5084 bytes
SHA-256: 3b645849ae285153a886fd64591f77a2ec3ef5294b04a5f54e835df4c1a57eeb
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 10168 bytes
SHA-256: 71b7dec22024a559a42b74e8645048090137094d87762d0926ac36f5d0518b9f
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f