Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6ea8240aae3290…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 03:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 607963b973477e5c00f354da4db39dcc SHA-1: 235d121db3e2f3c744b56bedf9d27095306510be SHA-256: 5e6ea8240aae329080dbb86a5eac809a644cf63a453d694d02b9b829a52f1313
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains an external URI pointing to a suspicious domain. The PDF is also flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=how+much+is+international+registered+mail PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473023/normal_601e6578547e3.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/e07b3.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/82d7f5f3fc6c.pdfIn PDF document text
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/jozed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_60411ca2ecbd1.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/wusamo_guzonak_tunidijibasujo_defuxelov.pdfIn PDF document text
    • http://zelolugo.22web.org/irregular_ir_verb_conjugation_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375355/normal_5ffbdb8ae3200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_60437cc82ae3d.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/petodame-pagewo.pdfIn PDF document text
    • https://reguzuseja.weebly.com/uploads/1/3/2/6/132695615/6173859.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/gukurodetatatukev.pdfIn PDF document text
    • https://vososodimeditu.weebly.com/uploads/1/3/4/5/134599865/2898640cf37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c32b531-06b8-4f0e-8559-4953c58f0cec/how_to_find_the_model_of_my_singer_sewing_machine.pdfIn PDF document text
    • http://wutogiku.epizy.com/lg_front_load_washer_dryer_combo_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/33416844057.pdfIn PDF document text
    • http://wowonija.epizy.com/susan_scott_fierce_conversations_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c89ae-4696-4eb9-abf0-732ed49e1510/un_mundo_feliz_pelicula_completa_subtitulada.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/af_reserve_dental_exam_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1f3327-89e1-49fa-beda-af80319a76f7/foxconn_g41mxe_motherboard_drivers_download.pdfIn PDF document text
    • http://lusozeto.epizy.com/normal_blood_tests_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f6c999-c07a-4c92-bb7a-ccc1089c36f9/gepegafekewosavofejigike.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5408 bytes
SHA-256: a3806265004cc936759410b9dae4b38823f805f8170b63499fce550e6f5a7d51
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10392 bytes
SHA-256: 99c28e0e25608e6d9cacc7a1f92066f2001cb7df047b1dbb434be353e741af77