Malicious PDF — malware analysis report

Static analysis result for SHA-256 1085b26c0c66b039…

MALICIOUS

PDF

67.5 KB Created: 2021-03-03 23:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64d1be6449d3ef0b43d7f039c7e5f5b6 SHA-1: 21566c07172a3dbe6622d11778f1492ef5041f78 SHA-256: 1085b26c0c66b039c65ae3439ce490f5ed46cdb5a436edc2cd8f1d298b2d1902
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 0.9998

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://jacksth.ru/123?utm_term=cuales+son+signos+de+entonaci%25C3%25B3n PDF link annotation
    • http://kojazunupetip.mygamesonline.org/gologebafexozebajus.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/lesasi.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/Xiis3jh/history_of_religion_in_africa.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/nodupuk.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/jovarofivadanodo.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/8833711.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/kosadilerexutakepatelif.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/9054813.pdfIn PDF document text
    • https://ronaleju.weebly.com/uploads/1/3/1/4/131482819/jesupatizezodi.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/mukepaje-medami.pdfIn PDF document text
    • https://xalovediluf.weebly.com/uploads/1/3/1/3/131380345/xiwojamab-zewis-gawalizawos-kinarakax.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/5339564.pdfIn PDF document text
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/158fde74356.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/tajerodomudetotupubibefal.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/how_to_turn_on_power_wheels_dune_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/xjjHZv0/vumisabogeruxopulejuta.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/fugeji_tarenuvisu_zorewapuw.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/7988398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowawaba.atwebpages.com/vafuzuzinok.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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 5052 bytes
SHA-256: b1876473f805e46570f181a36d3f49f66cc79028199c20ce00ff33d4f9a0bfa4
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 11128 bytes
SHA-256: 7c68013568995363c5719086863c47af2015bddd47db87298484a7659c5f3ccf

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