Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1653004ae733326…

MALICIOUS

PDF

69.7 KB Created: 2021-01-17 05:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5244dd1c9b84e9b8867bea2a9cb5af71 SHA-1: 7b4f017ce8c5daecf5c84ce5376cdf5efcda0052 SHA-256: f1653004ae73332651b432f9cf9daaf955bdf6f20c3d73ff890873687748d580
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=best+manual+can+openers+for+arthritis In PDF document text
    • https://site-1166620.mozfiles.com/files/1166620/oc_all_star_football_game_2020_roster.pdfIn PDF document text
    • https://site-1178268.mozfiles.com/files/1178268/wubokupegogulemumif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_5fbfde5101b4f.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/dunkin_donuts_stock.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fa44ffb17b89.pdfIn PDF document text
    • https://site-1175077.mozfiles.com/files/1175077/garden_word_search_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f94c780d991f.pdfIn PDF document text
    • https://site-1172118.mozfiles.com/files/1172118/call_for_help_emergency_sos_iphone.pdfIn PDF document text
    • https://site-1172235.mozfiles.com/files/1172235/disneyland_resort_packages_costco.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/tidererujabaku.pdfIn PDF document text
    • https://site-1174558.mozfiles.com/files/1174558/97553208155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/evil_dead_hd_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/jurassic_world_indominus_rex_toy_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/vutokajasefoledemerivir.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 5304 bytes
SHA-256: 906f0eba4671192ef029121b09c60c4db9d66e81a47eca13e8cc63053efffa93
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10236 bytes
SHA-256: c929f710ce6e78ed5dbe986ee1f6cf55b49f78f3220174776a5cf1780514fdd9

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