Malicious PDF — malware analysis report

Static analysis result for SHA-256 306a5670616f7b2f…

MALICIOUS

PDF

76.6 KB Created: 2021-02-06 20:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3709de698b69455cf6fb1bb109b7d38 SHA-1: 52eec0dcee13e94544aaf7373b5a6abdc70816a8 SHA-256: 306a5670616f7b2f887c53cb84b4516cf87f9d20af8c98448fc541ff8c6f2cea
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing and trojan threat. The presence of a download button lure, combined with an external URI pointing to 'jottigo.ru', suggests the document is designed to trick users into downloading a secondary malicious payload. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, but no clear instructions or further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=adura+madin+eliya+galanawa+free PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/ghdUhiC/gigaxeratomiparabiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/WoheNjg/super_sonic_the_hedgehog_full_movie_2020.pdfIn PDF document text
    • http://ronojalad.22web.org/american_sniper_soundtrack_free.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/XI2O0if/91607342415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makekafes.epizy.com/blood_bowl_2_team_guide.pdfIn PDF document text
    • http://pamakejexo.epizy.com/sewekaturegejesibubetaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/95555978807.pdfIn PDF document text
    • http://marojinoz.rf.gd/greetings_worksheet_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/jifitolosor.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/35900938447.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/cambridge_pet_answer_sheet_sample.pdfIn PDF document text
    • http://taputideletu.rf.gd/forrest_gump_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/remove_local_guide_google_maps.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/always_smile_images.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 5232 bytes
SHA-256: cdd0c55e7a88520ec87883729cc63a7184524c2e336b411cc9a54539ba6380fa
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 23460 bytes
SHA-256: 898cf31985d70d51664864074437767418ca9cfb5f39c9b11762cf1801a9eec2
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 8888 bytes
SHA-256: da719732617e5e73b3ae9e0bf0c0a556456058858339c55a54f96d9a0499f67b

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