Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc59964c85bb7169…

MALICIOUS

PDF

78.5 KB Created: 2021-03-10 20:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189533e868e5ae149e1b8f70b32e5faf SHA-1: 107ecee334eee117cea863ee9605b7b7217ca8b3 SHA-256: fc59964c85bb7169fabee5d64191756f8ad8078abeb65b07c615fe225d7b5577
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('botokaw.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-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://botokaw.ru/123?utm_term=fly+away+home+book+report
    • http://mynasert.online/first_aid_for_burns_and_scaldsh4dsg.pdf
    • http://pubguckazan.com/93755992741xtivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fizufapu/casio_mens_pro_trek_prw2500r_tough_solar_digital_sport_watch.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_eaef6a2428634555a4efa3285179c4d0.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/conflict_management_techniques_in_project_management.pdf
    • https://s3.amazonaws.com/mamibis/al_ghazali_books_urdu.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/vizio_65_inch_tv_stand_walmart.pdf
    • https://s3.amazonaws.com/ninasivol/89024558111.pdf
    • https://s3.amazonaws.com/tedowafomaru/uc_browser_windows_7_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/a34fb9f4-b97d-4d47-a7c7-fb61e28000df/lituziropej.pdf
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_0905453b0cbb4a119647e6e1b2ce946f.pdf?index=true
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_afc09fa9197048d5b6168744fcc38558.pdf?index=true
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_2d38b7b9fd0f43cdaa3c36dbafe12211.pdf?index=true
    • https://s3.amazonaws.com/vexosafugunu/diaper_party_invitations_templates_free.pdf
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_cb53c52da76344d4a2a3f0e020af37ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae4970ce-d4f0-41fd-8349-4db656aea27b/firalogananobezezan.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_b2c80e101cd64fb598569dad7a5f16d4.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_5f07119349124afe9e41337539247e75.pdf?index=true
    • https://s3.amazonaws.com/wozowuledij/hummel_age_guide.pdf
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_c68821ccf79645e39dc121b5ee43ac7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f712ea21-18c2-4a44-aa65-b42463d83896/fafuruput.pdf
    • https://uploads.strikinglycdn.com/files/2fc590b0-f785-4cf6-ba6d-a49042984df1/ranesog.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_off0000f5db.bin
944d74cd6d4e6ffbaf9dfa8a7230f19f7999d45fc3a8c911ea45421fc10ea995		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 5236 bytes
font_01_sfnt_off00010790.bin
11c4c26ab0f75531107398aa06944f800cbeda57090da4912dc9bbd5fa92dbbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 10764 bytes

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