Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9aaca961cfd94…

MALICIOUS

PDF

79.4 KB Created: 2021-04-02 17:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 73728b27b64c8222e38bfbdf6f7512c1 SHA-1: 8088f5c2b8ea4136e5c75d2f2b5af5062827080a SHA-256: 6bb9aaca961cfd94fbce168938959744964f6a05dbb09f7186b3a26ccf3c698c
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 0.9992

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://fokemale.ru/strik?utm_term=brother+hl-l2360dw+printer+keeps+going+offline PDF link annotation
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/pijofaf.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/70f5e8b3e.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/vowuvevikotadijiwuz.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/soil_biota.pdfIn PDF document text
    • http://xigotev.iblogger.org/50239362698.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/xexilasupuv.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/5f91dd84f22.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/gipinajavasu_muvabodovofozi_jexovavuz_xavem.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/what_is_new_in_oracle_database_19c.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/82f7111a355e.pdfIn PDF document text
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/6865176.pdfIn PDF document text
    • https://poguxepo.weebly.com/uploads/1/3/4/5/134509835/2234492.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/wokuvuzotuva.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/8400390.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/8140e03b-164c-4ce3-9937-3eba88dac8c1/39906085082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36210902-f8df-4794-bcca-4ff59ad8c5c7/mortal_instruments_book_series_summary.pdfIn PDF document text
    • http://renubinivudeti.epizy.com/sivokumepixizobimib.pdfIn PDF document text
    • http://kegigija.atwebpages.com/rokawanavopunupeboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a13d958-0e12-49ba-94cb-1b92eebb9137/94682110114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e50818-4906-4316-900e-06eda1bb8b4e/sanad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab986da-d2fa-44bb-a392-9e66bba14956/gumowefewutujomisija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0a69ea-6510-4286-a473-0877482831cd/how_to_find_original_photo_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b846436e-cba3-453b-ba1d-0036459288b5/how_to_speak_english_very_well_app.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_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 5920 bytes
SHA-256: 0931cb6d7b88d5c9648f22d1be03670c2f7da91601771553f670d99b33e464cf
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10696 bytes
SHA-256: 8823d6a50d2a3d38c2bd3fe73bfaabc8f83cea6de3af2a9cd1671a36dc372563