Malicious PDF — malware analysis report

Static analysis result for SHA-256 d354f049f258f9ae…

MALICIOUS

PDF

68.2 KB Created: 2021-03-13 16:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52a7cc7440a3e2c7ad033786c9e9643e SHA-1: 9a5d7ea5f7b435c2c0514f378eb493a3b8eca540 SHA-256: d354f049f258f9aeaaebdc883d017cbeaf62ad3845d5b0fdf692f2ea65680404
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9992

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://jottigo.ru/123?utm_term=bbc+1+guide PDF link annotation
    • http://2220202.ru/zefitalifekomonvvu91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_600c21a16692c.pdfIn PDF document text
    • http://choosenews.space/fajofipenizazoxfgh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fdf3063c3b62.pdfIn PDF document text
    • http://uscreditreport.info/42700931678lk332.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/iZyfihA/sim_card_info_app.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/cjihfhf/flipgrid_reply_icon.pdfIn PDF document text
    • http://yeswins.space/langston_hughes_salvationvrhln.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/4gjCtqY/27462486451.pdfIn PDF document text
    • http://mimisijuz.mypressonline.com/19701851722.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/dfhauFE/58258179102.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/cgeghu6/bloom_s_taxonomy_verbs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ihgevhe/perimeniloxova.pdfIn PDF document text
    • http://lnstagramsupportlives.com/vikizinexusijifujeboborovw8m6s.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/cjdjgjb/white_fish_lives_matter.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/eIjjSgc/2347891019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_603a771013f32.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/f8hbQcg/cowboy_chicken_menu_longview_tx.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/borema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/61213014812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc7888d-4e94-4ff6-9d74-82b853ba2b32/buboloxakusafabixim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0c2dd2-fd43-4ef3-9f35-11841b84d8a9/34212560924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d911d48-c5a8-4c00-902a-573655ac5781/nimugapobuwedilolik.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/anthropological_theory_today.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_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 4832 bytes
SHA-256: 163527754a38f533838ecdc929841b74e9a5c36564568e687876c7fd9e5853ec
font_01_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 10328 bytes
SHA-256: f40437c74ab70f9c149bc60df5c678327731ebed8bb57134d57626c284d38574

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