Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9f9d9d598a306f…

MALICIOUS

PDF

74.7 KB Created: 2021-02-05 22:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9dd619e519eeac3e70add3234b5fa0da SHA-1: 2a04e69766349ff6ee23f0c9bb2f17ceb20816b0 SHA-256: 7b9f9d9d598a306f70593acf334fc00b90c00e79aeae84d1a599bdc63638ad2d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or using UTM parameters, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or malware distribution lure.

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://bologen.ru/123?utm_term=jumanji+welcome+to+the+jungle+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5ff8bc8ba978e.pdfIn PDF document text
    • http://simultaneously.space/tavoximoxikbijnq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5ff1974eb7ff2.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/iZifheg/zevekinigigagakon.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/iqzAzhc/manage_america_resident_portal_sign_in.pdfIn PDF document text
    • https://kazumole.weebly.com/uploads/1/3/1/4/131454435/49a4d63837e.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/nozewanif_fuwixamav_bigemalanimi_buwexaworuvafi.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/tUjhxRk/mirchi_status_video_download_2020_new_best.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_601b0c08f1df0.pdfIn PDF document text
    • http://pornbustyvids.com/simple_present_affirmative_negative_interrogativexh8km.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fc73d085bc45.pdfIn PDF document text
    • http://retys.fun/chortau_dual_dash_cam_manualnb8zm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fcea20a46ec2.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/5KPUhfC/vexing_definition_and_example.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/huhciaV/teak_wood_sofa_set_price_in_madurai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://getewubajup.epizy.com/acido_urico_elevado.pdfIn PDF document text
    • http://femejedad.epizy.com/jacksonville_jaguars_coloring_sheets.pdfIn PDF document text
    • http://sipopos.epizy.com/wajiwakovawaxidineleji.pdfIn PDF document text
    • http://febiked.rf.gd/significant_beneficial_ownership_rules.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 4976 bytes
SHA-256: 45cdd5c5242459eff74bb13cc5b06e08396509fa3740211e21abc347c1ca8ed9
font_01_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 11252 bytes
SHA-256: d37dbdb347927fae061820fe667ad8304cde3a80a3e3d2ea2fe1041817be97bf
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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