Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b8b0bdb7d7f59a…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 13:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: eec3e9b32894b71dd277b61ca8419939 SHA-1: a7ee1ef40926dd22129b75b14513598039f4c03f SHA-256: c5b8b0bdb7d7f59a39448477e2b311014d8d9408f6e3186a91b29c9c304a22eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to sites that likely host malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=senior+machine+learning+engineer+salary+bay+area PDF link annotation
    • http://benosetib.iblogger.org/53985156422.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/vilivupobop-furikeninarexu-jerofopikox.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/qiaggpx/fun_101_okey_plus_indir.pdfIn PDF document text
    • http://kekisire.22web.org/41892966142.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/difDnhj/mx_player_download_for_apple_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jdOhaPC/lusobabikoxobu.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/GojighL/carnival_cruise_jobs_miami.pdfIn PDF document text
    • https://cdn.sqhk.co/sokodajep/hejgwhb/zakevikivuzo.pdfIn PDF document text
    • http://top-shop-store.website/joligqa5l3.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/jghRuiz/here_i_go_again_chords_ukulele.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/bc9563d5f2dc.pdfIn PDF document text
    • http://power-guard.shop/comic_strip_template061pw.pdfIn PDF document text
    • http://theporte.xyz/422589427172ubki.pdfIn PDF document text
    • http://barashik.space/how_to_prepare_for_an_impromptu_interview_presentationhpjnd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/resonance_jee_adv_2018_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/buvuxiviwurasule.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/livros_espritas_grtis_para_baixar.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5560 bytes
SHA-256: 6f5bea722d81f4df67dd2ede1d3aff8a311c1f40065788529faca11c29ed68bd
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10424 bytes
SHA-256: b3c5410af2707797ec8cf5b990b02c73a4856f8db5384280a8c124426b2441c3

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