Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e003cf7c35073…

MALICIOUS

PDF

89.1 KB Created: 2021-03-18 08:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 624a9257f3ffcedec8f6f9e686a77554 SHA-1: 28bd620c2635a83076646ae46ff067338933812c SHA-256: 051e003cf7c3507393eac995fe96aa72d41b7595700bda1bef91b490e32bd970
244 Risk Score

Malware Insights

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

This PDF document contains a large number of links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to unit conversions. The presence of numerous external links suggests a link farm or phishing campaign designed to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=equivalencias+de+unidades+de+medida+ejercicios In PDF document text
    • http://towufato.mywebcommunity.org/52484231064.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/lakabijazot-jinabux.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/yamaha_dgx_640_price_in_nigeria.pdfIn PDF document text
    • https://melitonewivowaw.weebly.com/uploads/1/3/1/3/131380875/vatulufifovivawogomi.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/alkyl_halide.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/bezab.pdfIn PDF document text
    • http://timinome.getenjoyment.net/what_is_dd_one_shot.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_to_get_your_ex_back_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuluxewamotate.atwebpages.com/what_are_marketing_strategies_examples.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/compendio_do_catecismo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/black_nature_background_image.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_ae4b9c461eb34facbc6444164b090a04.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_03071af684cb4d81b8d6a53768f59282.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_ee8c9995de6b42f5b800724a7403815d.pdf?index=trueIn PDF document text
    • http://xowilewegiwo.myartsonline.com/2000_ford_ranger_xlt_4x4_towing_capacity.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/76539472429.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/office_365_staged_migration_vs_cutover.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_be675c9d32614896bc019045b74b3c20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/gilutitejigebag.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_0c6fb0ee627e4d4798d9fd6c8ffbf8c4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 5304 bytes
SHA-256: e579a78bdd90ff6b8b0dc4cd3323741d4c85a9281c9d7f2ec301a1e24226c5e7
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 3192 bytes
SHA-256: a013e743cde49f822ed69f070f461658d882b80535349c9e2c7cd791c89ee72a
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 12512 bytes
SHA-256: d8f047ffc62f079cb8fe6482add09f2bdd2071b96a540ffe3ec095fdf05b00ec
font_03_sfnt_off00013e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2D 16692 bytes
SHA-256: 2544582dacc15f004c5ab9c51f1dea071aa4dccad9de29ec493ef8a68bc26a18

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