Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ab21cad9cc702b…

MALICIOUS

PDF

79.5 KB Created: 2021-04-19 02:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 301dc8aef596a7b49a6dba19c01b29b3 SHA-1: 5985f1dd2eb60445f29bd5af52dde46fa55f3221 SHA-256: c5ab21cad9cc702b160c24ccd0c1f0b9b840864977ea1b717eb0a4b3aa5cec70
186 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 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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=2008+ford+escape+xlt+transmission+problems PDF link annotation
    • https://cdn.sqhk.co/zazavoxujub/friiGid/plotting_coordinates_worksheets_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/fomanazoravu/jZDkpzo/glitter_live_wallpaper_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/xawenano/id3qavG/60819073064.pdfIn PDF document text
    • http://timedezalug.iblogger.org/lizotomajula.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/fhhFwUA/keneko.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/eMTiajf/art_deco_sculptures_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/fNtgfm3/avg_tuneup_2018_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/igC4Khc/switched_at_birth_movie_1991_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jijheZE/happy_water_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/i9ZZjBZ/cute_bunny_paper_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/VEBicji/warship_battle_mod_free_download.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://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_a7c3e6988c7949dfaa1b7ab4e8500b5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2718b3-5501-468a-99e0-198890a50656/bojaxasagisasami.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_80d06e3acaaa43ffab06e3314d87b291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fdc927-33f2-4c00-adc2-681c3e207a7a/call_me_by_your_name_2_official_trailer.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_2ae3c90dd87447178a138ed1ecd2da87.pdf?index=trueIn PDF document text
    • http://jarexuvi.epizy.com/cake_recipe_and_procedure.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_bce1b5cd700e4fdea16edba953a667c0.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 5668 bytes
SHA-256: f5ff3b9c8a6fa7a1ccdf983fa453b6aa19ab8e613742488ec5b714a7bfc04314
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10744 bytes
SHA-256: f340dbf4cd969d8bf3e1e10345c01606a3a8cf9f99f29e1a2b04aa447449b1db
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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