Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd6d3728e5d193a…

MALICIOUS

PDF

85.6 KB Created: 2021-02-28 23:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f3b14b6f10abe7e005227f5ca685e6bb SHA-1: d482e395be704ee3c1863527d4acb754250e9942 SHA-256: 5bd6d3728e5d193a9cc6ad2117deff5c2f2c0e11bb3545515fdade62e81face4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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=sql+queries+examples+w3schools PDF link annotation
    • https://cdn.sqhk.co/befozaxulot/hhzSjg2/frontline_commando_2_apk_mod_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/cijagcU/51143065705.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/wolenawulokupesum.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/98965267462.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hihzib1/spiral_staircase_minecraft_tutorial.pdfIn PDF document text
    • http://voxofixixaj.iblogger.org/bhojpuri_movie_nagina_video.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/nazat.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/aY88KV8/run_rabbit_run_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/jdkihie/resort_island_tycoon_hack.pdfIn PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/c1787d21.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/ea3Lijw/43997724042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekabugi.epizy.com/27286902254.pdfIn PDF document text
    • http://waroxudon.epizy.com/hp_officejet_pro_8500_a909a_wireless_setup.pdfIn PDF document text
    • http://kujafugakare.epizy.com/tu_aur_patlu_ki_jodi.pdfIn PDF document text
    • http://dimegebewode.epizy.com/moto_g_3rd_gen_price_flipkart.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5728 bytes
SHA-256: fbff2fa8c37af7f9b3c5359732d02f2b9d7f4a55509d497c7e4e8206c41ec894
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 15548 bytes
SHA-256: 8dcda364672680bb3b7faa161016fd1acd66e115753a6f3d0e6d75e005f38d15
font_02_sfnt_off00013443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13443 16076 bytes
SHA-256: c497e7020956884876526f9a9d0138e4369f5c46b3391b62f16f330352c2bc8d

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