Malicious PDF — malware analysis report

Static analysis result for SHA-256 2509c6cbb42850e2…

MALICIOUS

PDF

70.5 KB Created: 2021-03-18 14:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a17df063ec07cabbc14f950102751a30 SHA-1: 89d6c6db67928c6480a390f1854b5cdc147d6219 SHA-256: 2509c6cbb42850e2e96d757423f5f9d7f8867ec3d0f0b90c870b01c43f45ed0e
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 0.9997

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=five+types+of+chemical+reaction+worksheet+answer+key PDF link annotation
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/gavilodasenuk.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/Vgiifji/learn_spanish_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/J0zDRid/26132406072.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/b6hajcy/affirm_login_issues.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/f58c5890e4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5fd93c93e9e6b.pdfIn PDF document text
    • http://bixesifebara.iblogger.org/adjektivdeklination_bung.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/nozodixijakeg.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/norijenobinib.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/ieCxggx/time_traveler_s_wife_streaming_vostfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_603a28ce28313.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/dazumuvola-pesalot-posodadatozij-lelobosafelix.pdfIn PDF document text
    • http://gawoxubut.22web.org/function_of_liver_in_digestive_system.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/trane_cgaf_chiller_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/hcjfCUx/figowigujitub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazosaka.epizy.com/bionic_commando_rearmed_2_pc.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_ce1fc4939071424ca47c934f1a069c30.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_a7185d9b6eb54976b3e15ae1f55507ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2809ae99-bb00-4f61-8bc2-e4edbac5e443/kung_pow_fist_of_fury_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c3cbf6-8295-4964-a917-83e61e36e413/junior_project_manager_jobs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0515cc1f-684d-490d-b0a1-9c8ff8cc2edd/dekivisewejovaborabalup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 5528 bytes
SHA-256: b33f6a759f38be83cfbf4a4b841d7422ba591bfbf1cb20958838f3cc7135a14f
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 10012 bytes
SHA-256: abd9546c23307d7a86af2d50d4c6f730a035a924dd8a085532dadb16b659f25f

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