Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7b2b8c4f9edac8…

MALICIOUS

PDF

82.3 KB Created: 2021-03-30 01:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb2f84b2beab995838cf8b9a6171d111 SHA-1: 32d6709b9f435f1035c33fd60555dac8ec1bf236 SHA-256: de7b2b8c4f9edac89caab760450ab3c7867712c893cadcf4eaf0c5216f17f3a0
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 0.9997

Heuristics 6

  • 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 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://dafemum.ru/award?keyword=generos+periodisticos+y+sus+caracteristicas+pdf PDF link annotation
    • http://temilops.xyz/batman_arkham_knight_gcpd_riddler_informantmnz0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_603165ee65f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_6013b2948deaf.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/bebezirajapid.pdfIn PDF document text
    • https://laxumobunutag.weebly.com/uploads/1/3/4/0/134017566/689fdb0df9.pdfIn PDF document text
    • http://strahauto.website/project_management_masters_degree_nycmqbaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5fdfac930579f.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/zafopevorurode.pdfIn PDF document text
    • http://damvglaz2.xyz/27901045925nv5vs.pdfIn PDF document text
    • http://mritzoliver.design/road_trip_songs_2020_hip_hoptc1dx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_605f73e4b7388.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/9833543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_605c4eb85ec0f.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/fijoz_kesomosu_jinelabiponene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_5576a3d130b24e0c811624497b5f9324.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_f2b9ff93ec1e44888309b7f2bc72ecd8.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_16452f898fd84e64b25ce4ce8412fc51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/sobubadodelaxisafabugewi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/best_website_templates_for_wedding_photographers.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_8e0ffa1e1e2b41799edf6425a130c9f1.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_ccff514e9b4f4af5be884392105f7435.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/aditya_music_songs_free_temper.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_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 5252 bytes
SHA-256: e61092e90ea72e30f40687ea1563586ccf94eb85e16777eaf7ed6cff5081a291
font_01_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 12168 bytes
SHA-256: 3b03066e54aded8a20aaa8076a650ef60ec4b738f1fab3288c107d81a2de5de8