Malicious PDF — malware analysis report

Static analysis result for SHA-256 b421ed8231d0d42c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-12 12:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 26e16b841b90513df37f8117f5735ec2 SHA-1: 531a01ddfd197c2112faf10f19b5e56369bd81cd SHA-256: b421ed8231d0d42cb4b8e68f7eb4e35e7eda8de42572c6f987b306dbd3dc44c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9967

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://zajinet.ru/strik?utm_term=what+is+aashto+%25231 PDF link annotation
    • http://rbqjkwklnd.xyz/scott_scale_large_frame_sizeegrrg.pdfIn PDF document text
    • http://lnstagramcentre.net/toyota_camry_trd_2020_for_salejkywk.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/cbc55c63afa.pdfIn PDF document text
    • http://vkrowl.com/attila_total_war_ancient_empires_modcgffz.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/917249.pdfIn PDF document text
    • http://inglassrus.ru/97016309965xgp1q.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/what_are_the_strengths_of_humanistic_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_604eec9cc260a.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/giwugoxivefofu.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/siehihb/99749173553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_6008c6fbec55f.pdfIn PDF document text
    • https://cdn.sqhk.co/nazixasinuti/jAAhVMw/vazuv.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/ragub.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/pakosanisaralu-bomik-kekaxo-nesakisus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffa6b4370138.pdfIn PDF document text
    • http://medgaj.com/fun_home_alison_bechdel_barnes_and_noble89qxt.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/Gw9mkie/noblemen_1896_pc_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/is610jf/square_word_cloud_generator.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/2356295.pdfIn PDF document text
    • http://wirelessinfo.ru/177023710165ywko.pdfIn PDF document text
    • http://magicwoolshop.com/how_to_know_if_you_are_someones_best_friend_in_snapchatgrhtq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6019bf12db2af.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ih1ibhh/sadowomujanonovanitanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisavan.onlinewebshop.net/36482091644.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/39372008374.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/9910576826.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_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 4656 bytes
SHA-256: 534b8e334a39bead33fc9a1bcdb1b48e6337f38a693cd79a5d94735f8b7017a4
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10632 bytes
SHA-256: af9bcafbb1c5c7433d28e552b949b141983c5b3ae1a062da8bc1d9e559d65082

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