Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a8f51e10049af4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 13:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 728b7bcb24fd11772030e6f8d26bd1c3 SHA-1: b8a2b1038d69348467496b8f6509349a55863f8c SHA-256: e8a8f51e10049af4863e180faeb2a2038c7d9918aae8859ad38590e3fd88be24
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to an incident report form, likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=first+aid+incident+report+form+ontario PDF link annotation
    • https://cdn.sqhk.co/xojugako/aigdEgR/windows_10_update_stuck_at_100.pdfIn PDF document text
    • https://zizovotitimojuv.weebly.com/uploads/1/3/2/7/132712514/2865258.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/busidulaxotezanizexunan.pdfIn PDF document text
    • http://devgame.design/83488487250c40up.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/godemefojoxewupilir.pdfIn PDF document text
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/jatakemoza-xivinagiz-xujojokinigaba-tojibupanilabe.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/talilevesirujugin.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/5Z9ypXP/tap_the_baby_frog_mod_apk.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/7607f824769.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/0521698.pdfIn PDF document text
    • http://razvivatel.blog/research_methods_in_psychology_morling_4th_editionq94b9.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/4563179.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/Phaz4je/tewezegupuxonafup.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/xukul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_ce70be16f7084fbb96f23f0e24f88c64.pdf?index=trueIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/77584943689.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/ejercicios_ecuaciones_de_primer_grado_con_denominadores.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/80368044678.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_c4cf3f7e27af40a7b7de915a5c036df0.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_95c66c41a5f3427a8d60e9a2a6e08b4c.pdf?index=trueIn 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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5224 bytes
SHA-256: 1f072588f7702bdbf6aa611b882dbdf0dc388068468a45969531c56f254267cd
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 10444 bytes
SHA-256: 48bde6bdbe236abcf65de0bd6f4d44b679eca4ff487e73ee46ae331eec542e46

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