Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d48ff288807c5a8…

MALICIOUS

PDF

83.2 KB Created: 2021-05-29 10:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 70a0d67314075d180b354ca20f5e41d6 SHA-1: f380a3680feaaa0c09a8941415d8fa1eb1ba3caa SHA-256: 7d48ff288807c5a82bfdf4a0d35aed536b428f6eb3bfb7f1af9cb57da6bdecb0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=jesuit+oath+pdf PDF link annotation
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/pisivesumebidegepax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fde9e5436091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5ffd481287829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_605515128f77f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_600c8c27bba35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd2d35c7198b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_605652cbc2406.pdfIn PDF document text
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/figuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_600f22b2381db.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/478374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9574162-d17a-4750-8fb9-e7149d16ab3d/how_to_change_to_street_view_on_google_maps_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0819ac-d1a5-400a-951e-313986a8f183/2761369379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd591be8-bcef-423f-aef7-eb0e754ce7fb/endurance_shackletons_incredible_voyage_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638a8e3e-31c2-4845-8eb5-04a49bcfd713/are_all_hp_pavilion_chargers_the_same.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f26f10c-e818-4f50-b71d-1e020f0d7744/57878063999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cde57cd-675a-4a96-9407-546d0a8c7311/forever_war_seal_team_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f114a5a-b09e-4666-8eae-e89bdb2dd15e/how_to_crochet_a_beanie_beginner.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 4992 bytes
SHA-256: a5445198076bbff983a4a919842238cd8553fba500cfd2638084329be64fbfef
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 11556 bytes
SHA-256: 23222dda22dbc005f91c5ff2d62b741c296856e2f561b0d8dcf49ae1e42a94a8

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