Malicious PDF — malware analysis report

Static analysis result for SHA-256 6693a90f2cefef0a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-23 05:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 279dcbb0836c434ee045603580160c18 SHA-1: 323f4ae769f6e94acc5fabe0daa0be1529bd5199 SHA-256: 6693a90f2cefef0a9c3c566dc7592cbc9e2f4a83248a140e2fea02e1b479617e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. The embedded links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=5-6+practice+parallel+and+perpendicular+lines+answers In PDF document text
    • http://straponartist.com/77203673257ytewu.pdfIn PDF document text
    • http://lovepositions.info/94385001028hbf87.pdfIn PDF document text
    • http://dsv-trening.ru/pokemon_ash_gray_rom_apk_download9ozri.pdfIn PDF document text
    • http://floradoma.net/338025931072ex1h.pdfIn PDF document text
    • http://marketitaly.pro/how_long_are_dachshundsqyh8i.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/edmijdr/gowomizinevifir.pdfIn PDF document text
    • http://dreamingdeveloper.com/cisco_packet_tracer_commands_cheat_sheets8sec.pdfIn PDF document text
    • http://belldiscount.ru/64428582254zoyvw.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/MgdkceY/91849320503.pdfIn PDF document text
    • http://sesalon.xyz/good_luck_chuck_movie_in_480psqnhk.pdfIn PDF document text
    • http://tunezazetadu.22web.org/70789082913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figejadinopi.rf.gd/appendix_1_form_rex.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/baptiste_yoga_sequence.pdfIn PDF document text
    • http://bazejufojowopor.epizy.com/behavioral_interview_questions_nursing_leadership.pdfIn PDF document text
    • http://jidifulake.epizy.com/pekabujuvuxarewigo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/92651305021.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/86969013327.pdfIn PDF document text
    • http://vudatuvabejosix.epizy.com/centos_6._5_iso_64_bits.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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 5376 bytes
SHA-256: d572103cc18e579248fb7753ebfd4cb671bcd06647e022a8a9c85ffbd577647f
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10032 bytes
SHA-256: ee5f5895b296ef16c1903f948fe84cce3ee859938cf61a41c7c9f4241bd6b39c

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