Malicious PDF — malware analysis report

Static analysis result for SHA-256 749ac8bbf3dc8c3e…

MALICIOUS

PDF

93.4 KB Created: 2021-03-16 00:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 59f06ca2a9425c011e11053783ffe369 SHA-1: e8d6c2bd86bcee5fb853227f934ce51826a52b9d SHA-256: 749ac8bbf3dc8c3ec61ba2cb0405a21ed7ab91199a25e34009b3d7bb897c6f85
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://nipisod.ru/wix?keyword=reflection+practice+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff5f60374801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_6012337822c8d.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/palurejuwutetezo.pdfIn PDF document text
    • http://hargotel.xyz/143100172199eyly.pdfIn PDF document text
    • http://testvvd.xyz/clasificacin_de_las_cuentas_bancarias86d8p.pdfIn PDF document text
    • http://about-igsupport.com/which_laser_color_printer_is_the_best29o8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_6014350501c00.pdfIn PDF document text
    • http://apsdd54gfv.xyz/dubelaxisefobtb2go.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ff46c440d539.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/4763228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gozilum/coding_guidelines_for_diabetes_mellitus_type_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/31063208308.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_097a3105f7594c60912bce49feef987b.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_010abe6254ab4a1786398700ce837216.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/sedovotijugipenomuzufe.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/aristotelica_text_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/modos_de_produccion_comunismo_primitivo_esclavismo_feudalismo_capitalismo.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/35979586872.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 5156 bytes
SHA-256: 3802c171a3934734998fb7aac54a13e6f5609ee6940067f68957e07a48205d86
font_01_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 12276 bytes
SHA-256: 1d7a827caa47019d96d78651674f59a82da9f974e1a4aab6eba52b698df56736
font_02_sfnt_off000159e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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