Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0134c65e66f3c7…

MALICIOUS

PDF

73.0 KB Created: 2021-05-17 08:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 424ea9034f05887d9a5207233ab7bb20 SHA-1: 3e9a79acc223150a6d5fcbfe2201a99d0faaa05e SHA-256: eb0134c65e66f3c7b85f7456200f17961d30ec41b31918efcbeeb5b514b9b1ff
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=where+is+the+pilot+light+on+a+york+furnace PDF link annotation
    • http://gatowixipeba.mywebcommunity.org/chopin_berceuse_op_57.pdfIn PDF document text
    • http://tixshopclub.space/hp_compaq_elite_8300_mt_datenblattrhzua.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/google_sketchup_7_free_download_full_version_for_mac.pdfIn PDF document text
    • http://com-login8.xyz/36295223105mhchp.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/87803547219.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/lajilanavakurenolap.pdfIn PDF document text
    • http://tvoyoproc.fun/marketing_plan_template_downloadx87a7.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/ggjethi/46414462543.pdfIn PDF document text
    • http://websporizlehd.com/niravejsymy.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/7wN1sdh/8147979287.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/can_you_record_a_deed_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_04f9fa4f04dd4242a418ccc5c4a22d79.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_ba783fe35de9424fb1e79bd5a94c4e2e.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_03909319921c486b9eacf5f39ab32a85.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_b5a3ff64e20549738a9f9b8ef2ec8ef4.pdf?index=trueIn PDF document text
    • http://xobeminal.atwebpages.com/is_there_a_print_edition_of_wsj_today.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_d2a4140afb5f45ebab14bf5cb3c29e7d.pdf?index=trueIn PDF document text
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_6bb5143050de4cd680a7428ae2a64cb0.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_061216e420004ae7b4324ad5d0c6c145.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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 5456 bytes
SHA-256: fedd20b86fdade885dc1e4da7ef52af3dc9c5c70435a181001a3a7984652a21b
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10796 bytes
SHA-256: 9bdd9671379e601bbe0c766fda7a876cff5670d6dbeac878242ce62dcc91d330