Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2f752927bf6cc2…

MALICIOUS

PDF

89.5 KB Created: 2021-03-24 14:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c19de6bfe3a661fe608553513fea735 SHA-1: 800ebf13d136f142e8e74dff32d1461150e714c1 SHA-256: db2f752927bf6cc271f5799b58b6c720152003763d4f4d5fd0580c5a296cd4cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=cien+a%25C3%25B1os+de+soledad+resumen+por+cap%25C3%25ADtulos+rinc%25C3%25B3n+del+vago PDF link annotation
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/02e9c.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/ji2Andk/jimmy_john_s_sandwiches_smaller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_5fd9b10916d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_605affb42f9c5.pdfIn PDF document text
    • https://lolizafopig.weebly.com/uploads/1/3/1/4/131453679/17a985a.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/hqNibsc/87056652538.pdfIn PDF document text
    • https://cdn.sqhk.co/wobagibu/gMcCGhh/relaxing_music_for_sleep_and_meditation.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/neil_degrasse_tyson_joe_rogan.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/fJqxhaC/95075240311.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ciithaF/exploration_craft_3d_free_download.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/french_verb_conjugation_table_lire.pdfIn PDF document text
    • https://nuresipaxujetun.weebly.com/uploads/1/3/4/6/134683077/jaradoxabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_4b1a21ff93284b619475ce4358f2652e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/wuwejajizixerelarimobek.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/juzevitanamejinifaxob.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/garfield_kart_apkpure.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_65eb8055dfed4deab24fc851988ea96b.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_254110e495414addaddb433a4c839513.pdf?index=trueIn 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_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 5760 bytes
SHA-256: 525f54ea7b6c781086a26d9ce41879ff2721d5d202ea1158389365f2a58269a0
font_01_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 11928 bytes
SHA-256: f541d28714b81345383e09e9002170e49c8a5bcf79bc7ed042851b673dbb3986

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