Malicious PDF — malware analysis report

Static analysis result for SHA-256 58007d442d00f728…

MALICIOUS

PDF

74.8 KB Created: 2021-04-27 11:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6bec444f21c02aa45f93619e5c969bc9 SHA-1: 7daffa9408425d2e8a0ae90f9a0921f15350e664 SHA-256: 58007d442d00f7285b77e1dc5850fc6963c9c4e1849bc51128c407a0012f5064
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', suggesting it was generated by a tool. The primary attack vector appears to be directing users to external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=cazadores+de+sombras+renacimiento+4 PDF link annotation
    • http://idealslimitaly-official.site/glock_19_gen_4_magwell_agency_armsecjxa.pdfIn PDF document text
    • http://smartbright.club/speak_novel782ku.pdfIn PDF document text
    • http://cloudplay.xyz/rarabrat3v.pdfIn PDF document text
    • http://g2am2e.xyz/mivibujodirosokapomig0x2x.pdfIn PDF document text
    • http://tryici.xyz/343344382xpzs8.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/z_nation_cast_season_3_episode_1155673.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/how_much_do_graphic_designers_make.pdfIn PDF document text
    • http://hotita.space/ladovokevefisomubum39lqk.pdfIn PDF document text
    • http://mebets.xyz/bloodborne_official_artworks6d02e.pdfIn PDF document text
    • http://ndfnasg.xyz/asphalt_xtreme_revdlrwn4c.pdfIn PDF document text
    • http://copyrightnotices-form.com/zodujutexezorerexu3i3zg.pdfIn PDF document text
    • http://cleanup-sale.site/caustic_embrittlement_in_boilersph1n9.pdfIn PDF document text
    • http://bitcoinov.site/cuisinart_model_cpc-600_manualkvbgk.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/the_clerk_s_tale.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/30890731170.pdfIn PDF document text
    • http://scoretdho.best/68127681390ymp9t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18177223-93ae-4e8a-9aa7-f9db5d848aab/22062793081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c21857-ef15-4dd4-9977-ee5005b7afd5/osmosis_worksheet_answers.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_do_i_fix_the_sound_on_my_sony_bravia_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d32dc4-accf-450c-a18a-fe10542528a2/word_formatting_issues_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8865c6-3011-4299-9bf3-86340a6af40c/fovajirijuripavixarole.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/ripidavorijarutexixumir.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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5236 bytes
SHA-256: e06623cfe4688efd55736ea2a62b8208632656beacb311b34e3e266e5198e95f
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 13016 bytes
SHA-256: 1c18864849aebf3d8d33d7a92eda88f168a79627b294fee9bac05e3a8d0acb2b

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