Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caf0bff224e37a1…

MALICIOUS

PDF

87.6 KB Created: 2021-02-23 16:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a723efc43391532346c8be56c7f1720b SHA-1: de406ace94c1d4d7e53223a482a93cc819700ad2 SHA-256: 7caf0bff224e37a19672b2aeb665949c2508cb8f2a6072473afe9093e9430ff2
144 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an external URI and a redirector link pointing to 'https://bologen.ru/wix?keyword=apk+private+server+clash+of+clans', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=apk+private+server+clash+of+clans PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff9e239c858f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_600c11c19d6da.pdfIn PDF document text
    • http://olx-delivery.cc/price_of_electronic_choke41kyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5fe2e6a6a598f.pdfIn PDF document text
    • http://xozawuledol.iblogger.org/define_competitor_analysis_report.pdfIn PDF document text
    • http://dopatixa.22web.org/chemical_bonding_worksheet.pdfIn PDF document text
    • http://discount50it.pro/parkerbrand_52cc_petrol_garden_brush_cutter_grass_trimmer_manual4pekb.pdfIn PDF document text
    • http://rukozhop-guide.com/nixafunafezuzudezeropovdkjl7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5fd961104a489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fde6e897a9bc.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
    • https://s3.amazonaws.com/bexolamabad/shia_labeouf_transformers_death.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/how_to_program_a_chamberlain_garage_door_opener_953ev_evc.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/que_es_la_calcitonina.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/fepimazikilefejowolar.pdfIn PDF document text
    • http://volegurez.rf.gd/45286397301.pdfIn PDF document text
    • http://relamelekubapan.epizy.com/lanotuzidimefepozuber.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/81947597256.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/math_course_3_volume_2_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 5004 bytes
SHA-256: b82f2bd01c3b9820432c6831bde0aef214b7ba628a23c6040525a0aeae9b75ca
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 10412 bytes
SHA-256: 1266ef0adaff92984185d06ca0a3d7042df577137c5af71e1730037971643532
font_03_sfnt_off000142ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333