Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf31df449c36e90…

MALICIOUS

PDF

81.3 KB Created: 2021-03-16 06:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c3f56d1fcfe2a63260947d07c232bf SHA-1: 5921f3d2d16d56f15b3535aece38d54299c1d3f2 SHA-256: 6cf31df449c36e90d223fe299945ff3f91d4629e8268a81c836a2916158382bf
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of a malicious URL (https://nipisod.ru/123?utm_term=apgli+new+proposal+form) and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'apgli new proposal form', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=apgli+new+proposal+form
    • http://migriruy.ru/2776995767zr0li.pdf
    • http://copyright-central-media.com/jilabovijiteratojq3yj.pdf
    • http://agent-spv.space/new_mexico_tech_first_responder_training_programu0tor.pdf
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff90b2d2471f.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd1007d5b6d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzaganog/30051690085.pdf
    • https://s3.amazonaws.com/muvemasoxaji/how_do_i_change_the_clock_on_my_blue_angels_citizen_eco_drive_watch.pdf
    • https://uploads.strikinglycdn.com/files/d94a54c3-6f5c-4514-bed7-be1f61bad7d4/gesoxitaponulufi.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_2d364364e30e4fac92e5166998a76e25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bdcd3c9d-8765-4f14-9f65-a5d315750473/what_was_the_daily_life_of_a_native_american.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f08d4f6d773a4679aafb475d2b552e20.pdf?index=true
    • https://s3.amazonaws.com/jejulurowev/animated_sad_video_songs_free.pdf
    • https://s3.amazonaws.com/baxunaf/46814562566.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_90c6e94bb24a439ab0a5e7091973b4ae.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/rugipako.pdf
    • https://uploads.strikinglycdn.com/files/0edfcd77-233d-411b-b028-52ff153d7a82/10807637444.pdf
    • https://s3.amazonaws.com/litunux/circle_circumference_worksheet.pdf
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_198853d3455e40d58aca069eb8cf68d9.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/gosezoru.pdf
    • https://uploads.strikinglycdn.com/files/b4cfae50-6c62-4a4e-827b-5a1ba802fa77/accu-chek_aviva_test_strips_discount_card.pdf
    • https://s3.amazonaws.com/libowebujakux/eversource_report_gas_leak.pdf
    • https://s3.amazonaws.com/xixonu/adobe_indesign_cs6_direct.pdf
    • https://uploads.strikinglycdn.com/files/6ddd6999-50f2-43d4-8bd4-c1c9b8dfc631/metodologia_dela_investigacion_cientifica.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea08.bin
e4dd36ef2d041ea787a51c85676b1aa62cd8dcf57ae65a94f91c931d24172b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5300 bytes
font_01_sfnt_off0000fc13.bin
3b0427bc6449df9d9462f0cbe575aa6df0e4abc041c61289668c7f2752121da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 11228 bytes
font_02_sfnt_off00012296.bin
96e06106e3006553386fba87c243c4a28b622411f61b38071404873282de63a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16172 bytes

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