Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f140655ec9298e8…

MALICIOUS

PDF

78.0 KB Created: 2021-01-15 15:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 075786c86d7f58b7512ad0d09e381b44 SHA-1: 230b67a9ffb3f951eaf4f081e96ce7ccd3813e5c SHA-256: 2f140655ec9298e8d6daae0090e291c0d01fab8849af42e93b11a8c8e2d6e620
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via these links, which is consistent with phishing or malware delivery campaigns.

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
  • 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://ggtraff.ru/123?utm_term=hp+star+wars+laptop+i5 In PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/budalovitekugabonov.pdfIn PDF document text
    • https://site-1220925.mozfiles.com/files/1220925/betutaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f94ac68b913b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fe7e25c31f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fd9206565c14.pdfIn PDF document text
    • https://site-1178139.mozfiles.com/files/1178139/89026210570.pdfIn PDF document text
    • https://site-1171718.mozfiles.com/files/1171718/geobook_1e_laptop.pdfIn PDF document text
    • https://site-1245969.mozfiles.com/files/1245969/pajopekotiwufodo.pdfIn PDF document text
    • https://site-1173223.mozfiles.com/files/1173223/teach_english_online_jobs_from_home.pdfIn PDF document text
    • https://site-1172155.mozfiles.com/files/1172155/botuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f934694eb2b2.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/polexebuj/bms_sales_performance_brisbane.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/content_process_product_education.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/carrom_board_king_game_apk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A4A 19280 bytes
SHA-256: 0b78c92ec144fd5364faff3cf672dcba88cd53fc03e064c9e819ff368b5b28b8
font_00_sfnt_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 4988 bytes
SHA-256: d18be8d742585289b09518fd1393e0405bc96c78c307c2f50808589449bd3bc1
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10580 bytes
SHA-256: c41fe8610b1f5db9fe0c7bc89699c70914eafa1d6c366949074f5248439400a5

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