Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba358c9cf2a3050d…

MALICIOUS

PDF

72.9 KB Created: 2021-05-16 11:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6791b5881444e3eb532c695717c2817e SHA-1: b30e72940226be7c4c0795633cd415519819d872 SHA-256: ba358c9cf2a3050d155bcef9626d13af43da8852f60a3e6905d964d5b22b3898
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 0.9971

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://seumenha.ru/strik?utm_term=historia+universal+jose+rodriguez+arvizu+3ra+edicion+2017+pdf PDF link annotation
    • https://cdn.sqhk.co/detateseb/Hhhhcgg/outdoor_go_kart_racing_tracks_near_me.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/9dff9cfd3d4b46.pdfIn PDF document text
    • http://changely.club/starbucks_coconut_milk_nutritionsrmz9.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/Sjj1jhF/ampere_meter_digital_price_in_pakistan.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/f4a1fc2e.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/packet_switching_vs_circuit_switching.pdfIn PDF document text
    • http://adachivia.store/pasiluliwilidapizodul2v09g.pdfIn PDF document text
    • http://hookup157.online/orchestra_padalgal_video_songsu87ad.pdfIn PDF document text
    • https://xudubuwar.weebly.com/uploads/1/3/4/0/134041851/8696205.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/8lZjfhb/run_party_application.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/wonemoreluramuba.pdfIn PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/e34eb514.pdfIn PDF document text
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/resujege.pdfIn PDF document text
    • http://vipadminler.org/28737068224ujkkq.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jfFdhhe/komevego.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/2ea879736ceeb.pdfIn PDF document text
    • http://rte-ita.fun/sovemenupokaxaforibi8ypqg.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/gadig_sojunexemasa_rumudusubibe_zorabixiveridu.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/8d998926e8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4828852b132c41dda2b6bb1739ba63ea.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_2cb61f304f544a6887bfbfb5b16b6ce3.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_b115a0a08d154b119c2fcd988ce0b06c.pdf?index=trueIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_20d3232fdf0d47a09427400635161590.pdf?index=trueIn PDF document text
    • http://jokajejuti.atwebpages.com/70383302984.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_fd89c96a68054557aa558fceb5292f0b.pdf?index=trueIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/kambikuttan._net_novels.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/jejanabaxujiwunesopedosuv.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 6040 bytes
SHA-256: 1b8a8277f450902e22a3c79b488da858b7334eb0cf7e57cbe58c2ce5405c4f09
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 11016 bytes
SHA-256: 08e253c666f8086523c6ff65da3abca67da23f379a219aef96afe3832d7305a0