Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c2f0d5c50010ef…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 00:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d56c3ae5d14ec09b1e88136e650459ee SHA-1: da8d57de09bfe507697bfc575e97ca6f97d9f494 SHA-256: b5c2f0d5c50010ef717267724db6758eb6d33b3dba55ee4844ebc6c9c67ca8b6
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 0.9998

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://botokaw.ru/123?utm_term=office+spreadsheet+compare PDF link annotation
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/lufakokurabexek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_6031f6f2e2bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600aca68c706f.pdfIn PDF document text
    • http://presalon.xyz/706224749528a39q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fec345aeec53.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/ant_simulation_3d_full_mod_apkzo124.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/wolfgang_puck_pressure_cooker_recipes_chicken.pdfIn PDF document text
    • http://braco.ru/mesuximosufukepezusubekezl2i6a.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/1332318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fce74d2f1b86.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/pimubutodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_6037b520caf5b.pdfIn PDF document text
    • http://all-system7.work/97036791859gyxqs.pdfIn PDF document text
    • http://merishwheelrecords.com/how_to_add_instagram_link_on_facebook_storyo0c7o.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/on_the_origin_of_species_by_means_of_natural_selection.pdfIn PDF document text
    • https://vewominejijisos.weebly.com/uploads/1/3/6/0/136053907/9f8c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozuduno.epizy.com/joxorelas.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/introduction_to_economic_zoology.pdfIn PDF document text
    • http://moliwofasekimu.epizy.com/free_autoloader_blackberry_q10.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5388 bytes
SHA-256: f1db7226a57baad776d6bbfc0a2d76c3771e91e4befbef022cf4b80d82e02cc5
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10864 bytes
SHA-256: c34f8cf5040f3f641b9dea4d9b273b2cea1262119d49f1ec77082d62d8fcece7