Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9a206a06c8dc5…

MALICIOUS

PDF

75.9 KB Created: 2021-04-26 06:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff89c04a836a27b6b03ea92178a1bcb SHA-1: 7df25d299772acaa714523ed96d35023985cf6b0 SHA-256: ccb9a206a06c8dc58db71cc1e4a47e958627298c54c89de751b74dbcef21dabf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=safety+first+thermometer+change+to+fahrenheit, which is likely used for phishing or to serve a second-stage payload. ClamAV and ML heuristics also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/strik?utm_term=safety+first+thermometer+change+to+fahrenheit
    • http://usersdeviceprotectionservice.site/12036085618l8qyx.pdf
    • http://ekzo-fruit.ru/laberunovaboriseo1zav.pdf
    • http://komamoj.22web.org/karma_junit_reporter_options.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_96bf79b812b24047a0ef442ffea1fc06.pdf?index=true
    • https://s3.amazonaws.com/tisegovofu/tokyo_ghoul_season_1_plot.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_835ef6b355c342d6ae46b14c9234d5b5.pdf?index=true
    • https://s3.amazonaws.com/satedafadusizo/puerto_salida_balearia_ibiza_formentera.pdf
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_17f132861811409f9c272d740147a7c3.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_eea88efb9ae142bca46d138ebaa2d378.pdf?index=true
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_effd2192542a4c208c3f51ad352b76d1.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_322616c0531e48b0a6ce7486b9eaed51.pdf?index=true
    • http://pizodixevefok.rf.gd/12778626077.pdf
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_dc61dadfbdb04a988f5bf39abc03416d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b64fef07-3be4-49eb-bfcd-d265f27c7269/61964201771.pdf
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_2869471b3aa8428fb9a77cffc4666538.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29d78072-0b4d-43d4-bbca-0e604f2d9e0a/55368883114.pdf
    • https://uploads.strikinglycdn.com/files/30e8147e-f461-4729-8af6-c0eccd6ab53b/beachbody_21_day_reset_meal_plan.pdf
    • https://uploads.strikinglycdn.com/files/ca4009a5-069e-4160-9104-c6fb9654229b/marco_aurelio_meditaciones_libro_4.pdf
    • http://dovobol.epizy.com/pedonurasutime.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_off0000e71c.bin
43c8088d5d49022f025cdcf56488acafd6804e16631cd19c8039e47fd4885190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5468 bytes
font_01_sfnt_off0000f999.bin
92ec011b691b3bfc6919b5803aeecff1a832b4e85a5a0822b25441d5734c6934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 12020 bytes

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