Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48e63969a7c4204…

MALICIOUS

PDF

69.8 KB Created: 2021-03-04 22:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6834942ffcdb9d95fd3cd6ae9549ee7e SHA-1: edfb7250be998c306fdf7f2c0402fa73cfc92973 SHA-256: e48e63969a7c4204fe3dc53fb28017b1c438fd029edeca3ae961ebd3efa61528
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to an assignment, likely intended to trick users into visiting malicious sites for phishing or malware delivery. The presence of external URIs and link farm heuristics further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=assignment+s1+collaboration+assessment+guide+economics PDF link annotation
    • http://fuvisetitisenon.mypressonline.com/flow_shear_stress_equation.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/how_to_drain_radiator_2002_chrysler_town_and_country.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/what_does_the_maple_leaf_symbolize_in_canada.pdfIn PDF document text
    • http://vofufime.mypressonline.com/31114904374.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/57947858208.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/what_is_the_meaning_of_the_nutcracker_ballet.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/zojemazagexokelojevekow.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/how_hard_is_it_to_set_up_a_wordpress_website.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/dremel_flex_shaft_collet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/how_to_do_knots_with_rope.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/what_is_social_constructionism_in_psychology.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_e743a5dad9ca44028b30a03a1e700fa6.pdf?index=trueIn PDF document text
    • http://romofimor.onlinewebshop.net/waxokaniruwodujal.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_08d99504c25d4f15b276a6fc283e470c.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/what_is_the_main_idea_of_the_watsons_go_to_birmingham.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_586c9ee815594bbca76578fb374e12f0.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_79442a0283424bb590cb0898d77b18fa.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_48402c8538d14a168ed9e95925039b8c.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_8d287bbfe67f43cbbf65a9405c94d9bc.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_a9067c72a17441b8be2ee0c4d68d6558.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_2ab0e3cf0cf84e0280926c5d76b9f31d.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/what_is_the_best_alexa_for_music.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/bamitafarun.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/45691028756.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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 5440 bytes
SHA-256: f70d9db08d1ace605dc5d98074e3d5e5cb2876843726ce74c706dbc5aa451a16
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 10432 bytes
SHA-256: 86d19317d5e09caba00214b248d5fa83e8e560cdd7ede005cad04911ff1fd66c