Malicious PDF — malware analysis report

Static analysis result for SHA-256 491a8b7978451f2c…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 00:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06a9062fe635b266271cea2de613bc66 SHA-1: 3480121161b306c98f67560616bec72573948a96 SHA-256: 491a8b7978451f2c8f5bfee110fa7866f0037010ad7dfef58c8c0495d58d79b2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external URIs and a link farm on disposable hosting. While no scripts were extracted, the sheer volume and nature of the links indicate a strong intent to lead users to potentially harmful sites.

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://pelibifir.ru/strik?utm_term=what+is+the+average+uk+household+income+2019 PDF link annotation
    • http://dfds.in/the_lying_game_book_synopsis9rj9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_5fd31a9b78429.pdfIn PDF document text
    • http://onlinesos.tech/mapgenie_bl2_maps91i5z.pdfIn PDF document text
    • http://bossyonlinex.com/addition_to_10_coloring_worksheetstq8ga.pdfIn PDF document text
    • http://noverst.xyz/zorisasavu94jo7.pdfIn PDF document text
    • http://lozhobelir.space/infected_cut_in_corner_of_mouth4ys01.pdfIn PDF document text
    • http://ourfutures.space/92748415817tszr3.pdfIn PDF document text
    • http://myluckywin.site/ar_15_upper_vise_block_canadadxier.pdfIn PDF document text
    • http://hiziryigit.online/reaper_death_seal_tattoo_designowrvg.pdfIn PDF document text
    • http://teachost.com/cyberpunk_2077_reddit_fps_fixi8356.pdfIn PDF document text
    • http://ptmonline.ru/math_worksheets_grade_6_multiplicationk0aoi.pdfIn PDF document text
    • http://winoraama.fun/24828436042ixm1u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6038d3a84fa43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_60033d39e2045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_60188cb6cd32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6039a30c324c5.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://rusiwebo.epizy.com/47381321446.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_6a176b3abf464e8f8aec3569ee49be4e.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_cdf779c8b4fb4e39b20e27d1d1987e49.pdf?index=trueIn PDF document text
    • http://derajovaku.rf.gd/jilotariverikale.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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 5856 bytes
SHA-256: a4e476ca06b3ab5bf327fab5c7052c94a8e2af59904dbab37fa8f5cba7537f3a
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 11076 bytes
SHA-256: 6e81e2b3494b69abb9262cb9fda85f6e7a7e369a6bcae44f4d8ee8ad26240e61
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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