Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78fec072c423c76…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 08:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c402303c56a52d6b4c91b14edf6bf3a SHA-1: b0bc695165d275e7db149e9f695ebddecc337284 SHA-256: f78fec072c423c768c00414e765b9171044bb9194f37e15b3e7171bd5d13824b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://mezovuduw.ru/123?utm_term=converting+decimal+numbers+to+binary+worksheet PDF link annotation
    • http://nedipupuru.22web.org/75360730663.pdfIn PDF document text
    • https://cdn.sqhk.co/dixajupuw/higefZU/brochure_google_docs_template.pdfIn PDF document text
    • http://keribek.22web.org/bilujopixomir.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/pac_accessibility_checker_download.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/the_dead_sea_scrolls_study_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/bIphigg/9080327831.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/dnytG0o/yellow_wallpapers_for_phones.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solarujarinobo.myartsonline.com/nijazuja.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/marriage_certificate_application_form_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/android_raspberry_pi_1_model_b.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_d2ac1fe78a3c4ecaba2fab586c12d326.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_c07baa9718854880bd730c756fd9616c.pdf?index=trueIn PDF document text
    • http://kapejuw.epizy.com/muxob.pdfIn PDF document text
    • http://gofeneneju.rf.gd/chicago_manual_of_style_bibliographic_citation.pdfIn PDF document text
    • http://direwoded.rf.gd/fonebuxo.pdfIn PDF document text
    • http://witigunakejawi.rf.gd/sonafox.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/35363977764.pdfIn PDF document text
    • http://gagutaxu.rf.gd/gelot.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_7304154ad003427c8185381a9e39e991.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_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5716 bytes
SHA-256: 84d9a46a473af3d69cc79a53408a7e241b5e9352766eb23b0f9377fc533bc52b
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 11500 bytes
SHA-256: 4e65fb49eec8412f01eefacae92f327e668eba9be4bb858e927e6ea061aa2ced

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