Malicious PDF — malware analysis report

Static analysis result for SHA-256 10798a983db07354…

MALICIOUS

PDF

77.4 KB Created: 2021-03-10 19:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a5e5978f477a799e8a62434cbb4b8721 SHA-1: fcd3bac37a98e3389681a76a0ada713d93543a96 SHA-256: 10798a983db0735418413ca08be30e573d6333892bd29b9fc704f47d891f94a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/award?keyword=exercises+lateral+epicondylitis+pdf PDF link annotation
    • http://urro-hu.com/bubble_shooter_offline_games_free_downloadf3cwo.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/16101575112pp8rn.pdfIn PDF document text
    • http://pycnidwzxc.info/going_postal_terry_pratchett_full_movielb1as.pdfIn PDF document text
    • http://docita.fun/528935891478kv9g.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/actual_faint_positive_blue_dye_test.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/26913628260.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/60603393381.pdfIn PDF document text
    • http://fit-italy.space/rayos_uv_definicionpcwpl.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/texas_zip_code_listings_2018.pdfIn PDF document text
    • http://reduslim-siteofficial.site/kolijozanakencutp.pdfIn PDF document text
    • http://kmikaerfs.ru/samsung_galaxy_note_4_digitizer_replacementj4lnf.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/67711539514.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/how_to_cite_health_and_safety_executive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wodedane.rf.gd/notice_of_removal_to_federal_court_form.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/nintendo_wii_console_bundle_new.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/anything_something_nothing_everything.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/33430251625.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/69930685396.pdfIn PDF document text
    • http://zijijexumejege.rf.gd/the_bfg_1989_giants_names.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/how_is_austenite_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/77506942953.pdfIn PDF document text
    • http://xewebumobodoris.rf.gd/72536602972.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/ashoka_movie_mp4_song.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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5276 bytes
SHA-256: a212ed7a96eff2dadc7e787d4b857e937cfb1d3725eaa930f68ff3e8d82f69ac
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10768 bytes
SHA-256: 7dc46d86bd450c272384246f993c3fbb9a76ad6a38581f146b0e8a83f2df87e5

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