Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd0328ac7a32e90…

MALICIOUS

PDF

69.0 KB Created: 2021-02-09 11:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 56ace3ae63d4fcd325d98a4537c54985 SHA-1: eb98b8354773a6c890622eb5a6635c3e1519ad67 SHA-256: 5fd0328ac7a32e9075f17cba5fac056a067853c834e16023108d731803a8ad32
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute malicious content via these links. No scripts were extracted, but the PDF's structure and link farm heuristic are strong indicators of malicious intent.

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://leonvi.ru/123?utm_term=electric+circuit+analysis+pdf PDF link annotation
    • http://skidki-day.store/97507399691qzxmh.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/wiziwijotonezu.pdfIn PDF document text
    • http://popularchoice.space/scout_proficiency_badges_book63x5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/hjeDK87/chapters_interactive_stories_promo_code.pdfIn PDF document text
    • http://kindraretterath.com/vuejs_laravel_admin_template_nulledqo3za.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fdb03c193041.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/aKgcwgh/wagibefulewasofaj.pdfIn PDF document text
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/9713293.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/eSXrTuq/offroad_bike_racing_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_600ce1d832762.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/eYiiigj/top_korean_keyboard_android.pdfIn PDF document text
    • http://mybiol.site/all_appropriate_preposition99h2k.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/sibaranazupodamejovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bakoloj/rhetorica_ad_herennium.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/diary_of_a_chambermaid_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/asturias_guitar_sheet.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_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 5208 bytes
SHA-256: ac1fedf99cb145b680100ad91034d54036f3aa55c326cf6446f5a2f9342fce21
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 11320 bytes
SHA-256: 74a306e706d38363a74bdd2901aa4937aaff9968b296e3fb84607986f4aa76a2

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