Malicious PDF — malware analysis report

Static analysis result for SHA-256 313b91b440850812…

MALICIOUS

PDF

190.5 KB Created: 2021-03-15 04:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f130182ec2883e47f3d63c0b83d7f89 SHA-1: 56f0b43f542407a2c6c105c7d89d5271d4c5b8c6 SHA-256: 313b91b4408508124677fe2ba504e03ff52a94f452f01c45250795c8b51f7591
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/wix?keyword=raynor+pilot+manual PDF link annotation
    • http://tonevagewalilu.medianewsonline.com/95368758843.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/seluta.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/whats_a_calorie_surplus.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/kadidavugusasojoga.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/mitral_valve_prolapse_in_pregnancy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/71bf32db-f639-4dff-8ba6-fd63091e46aa/lord_of_the_rings_sparknotes_book_1.pdfIn PDF document text
    • http://vilijakuji.epizy.com/koxaduvowoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b63fb42-17b1-4ab7-ba0c-4878841becf8/giwufosifevuxajijal.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_043e48b5bd9a4e1ca8ef40e46eacd383.pdf?index=trueIn PDF document text
    • http://xutenodopo.rf.gd/31616689986.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_733efdba93c549f1871d051ee69bf259.pdf?index=trueIn PDF document text
    • http://tabijuxez.rf.gd/rem_700_adl_synthetic_stock_modifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6caa05-c468-42e3-b688-6af751b93b7e/vojexuwarazawedato.pdfIn PDF document text
    • http://solejow.myartsonline.com/biwimitudumeguvegoza.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/18534099217.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/espectroscopia_absorcion_atomica.pdfIn PDF document text
    • http://widafasamuj.epizy.com/laxixaf.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/luvuzarivot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000292a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292A8 4872 bytes
SHA-256: 6d4e90e21cd402d2afa6e9aa114793180dda36fb391718c367c77ccc94a7912c
font_01_sfnt_off0002a397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A397 4660 bytes
SHA-256: 519348a47ef9b895074d1939e2f1c2eb165a9b7470aaf94f7d26997b5ca7b94d
font_02_sfnt_off0002b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B357 12804 bytes
SHA-256: 798d4d53d268e1f547177dc13cad46839b263f25448c34e381f2b14364ebb2a2
font_03_sfnt_off0002ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDF8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3