Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57bbf3ee56ed0ef…

MALICIOUS

PDF

103.8 KB Created: 2021-02-13 12:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 440b82d816360c321f71b398248762ab SHA-1: eebdeef5ca95684c006eabdf5988650a660af2e3 SHA-256: b57bbf3ee56ed0ef592143c496599592bb5abdf896a3af8c714c8afe099b8c02
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly indicates malicious intent, and the presence of multiple disposable hosting domains reinforces this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/aws?utm_term=aankhon+ko+teri+aadat+hai+lyrics PDF link annotation
    • https://cdn.sqhk.co/ruwonumatag/didhage/byu_hawaii_fall_2020_start_date.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/phbBieh/nokexolepekuwuzedaludolof.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/idbiihg/xifezujisaw.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/ChdUjjA/32482741474.pdfIn PDF document text
    • http://limecash.xyz/joomla_3._x_responsive_template_freejvfre.pdfIn PDF document text
    • http://tibetterrier.ru/karan_arjun_film_hd_video_song2yozg.pdfIn PDF document text
    • http://get3creditscores.info/guided_reading_resources_ks2hooyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_601527ff62873.pdfIn PDF document text
    • http://thelandofbadideas.com/canon_eos_utility_software_mac_freeqzojp.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/fUKcjaM/27622941760.pdfIn PDF document text
    • http://djami.ru/dixiferorejewumetuq4mal.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Y2HJiHO/simplifying_calculator_math_papa.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/jogffgw/huey_magoos_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489980/normal_5fe1afc2606fb.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/2hjBUge/moto_x3m_winter_mathnook.pdfIn PDF document text
    • http://snatural.space/free_video_downloader_chrome_browserfps2m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 5180 bytes
SHA-256: 9cc72ade86193821e75cb5e644f349bcd1a10412cb9a6a4078d3c66c3675584a
font_01_sfnt_off0001521c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521C 11044 bytes
SHA-256: 5a546568ef5954f4b703e4f8cb22de440272fa09211a1c0994d6f2ca9838b736
font_02_sfnt_off000176db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DB 8100 bytes
SHA-256: a79833e943b4861f7e8baddc8f34f67c6c6b00a3550f03bffed6ede636599ec3

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