Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ae8ae1207a73ed…

MALICIOUS

PDF

108.4 KB Created: 2021-03-28 02:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6ca1505c4e1f298b539cfed8d73b3403 SHA-1: 623073fa050044f43b968f08b638ca89f598496f SHA-256: b6ae8ae1207a73ed0d634d9bae8f3f66e346ba9a670179919bd1f622db9668ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable hosting or potentially malicious domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content.

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://vilenefex.ru/award?keyword=pagsulat+ng+balitang+isports+pdf PDF link annotation
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/lewum_bopuforilukovo_tepaki.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/jogupanexa_luteb_xupomev.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/roadmaster_granite_peak_24_specsiulxy.pdfIn PDF document text
    • http://nekretnine.site/nodugcknlr.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/hv2rNif/carriage_crossing_middletown_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/jbicsha/nearest_regal_movie_theater_near_me.pdfIn PDF document text
    • http://ulekschool.online/muvasapukfzjvl.pdfIn PDF document text
    • https://cdn.sqhk.co/ratusobuda/aZgcjhV/86097260245.pdfIn PDF document text
    • http://spain50off.info/shop-vacpump_wet_dry_vacuum_37.8-lwh7u3.pdfIn PDF document text
    • http://test123test.xyz/wupaziv6ukke.pdfIn PDF document text
    • https://fukoroxovelamos.weebly.com/uploads/1/3/0/7/130776486/jotewuzozojokav.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/i9wcNgj/reversible_reaction_examples_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/boegihi/sugaridusemenepozuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/baviruzini.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/solaroguwejupewuluneg.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/reliability_statistics_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/nulebowigogiwetijeraboze.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_off000163ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AB 5348 bytes
SHA-256: dae8fe325384433a76c083dc442f0a92a48c94c65d21da30cfa4adbe46cacab1
font_01_sfnt_off000175e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E1 15164 bytes
SHA-256: e7649d021068456a70ad36beb074d90242d867fc76520c0a02facb3f3f206de7

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