Malicious PDF — malware analysis report

Static analysis result for SHA-256 553223b8320dc540…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 20:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2659e71aed36aad66a229f0a443aeafc SHA-1: 8acfd4b1045f01ed4439c2781b742edb7d7a16ff SHA-256: 553223b8320dc540f8d12e5f5fea4c2bdbb17585258e622a5c3000581ad639d5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=what+is+honda+a16+service PDF link annotation
    • http://megatorg.ru/format_sd_card_canon_450duyr66.pdfIn PDF document text
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/gufepofetisavajukiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/TyBSDib/smash_hit_apk_2019.pdfIn PDF document text
    • http://uspex22.online/baby_bible_stories_to_read_onliner1bjy.pdfIn PDF document text
    • https://cdn.sqhk.co/mawodoso/3hdyjdu/21136066263.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/8494364.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/2970555.pdfIn PDF document text
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/febowomuzobi_venilexef_webofanipixo_rojifu.pdfIn PDF document text
    • https://lalexitadonu.weebly.com/uploads/1/3/0/7/130776325/sujidu.pdfIn PDF document text
    • http://flowerport.shop/best_speaker_for_fender_superchamp_x21m0fm.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/cPv1PmV/jogimowif.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/498e82ab-168d-4059-a902-362cbb01a703/vutawazigisiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf28ad87-afdd-4564-b0b0-e49c77c4d897/rcepteur_spektrum_ar8000_dsmx_8_voies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c78ce24-ee22-4060-b51e-7641ce3aef70/belilevuzenijapevamini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c53db9d-7fb4-4e56-8e76-4e16b4cea1db/zegamivokilupuxuri.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_2caed571c073438cba4b88dcccec18fc.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_4beb625ea450425f99eb4708da29e928.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_b3ad6dbe57d34e3c8340c2afcdc44745.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/878c6170-02c1-4e2e-966f-94f494087640/american_history_x_netflix_canada.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5272 bytes
SHA-256: a91c8b1f6ad1fd8296a277ad98824ec258e957dd46dba7982abb8ce51e8c78f3
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 11480 bytes
SHA-256: 9f79f83e527afb3764ff037b24d35150bf327cc77b2976434530e740b0753e0a