Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c9ed94880f649…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 09:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57458b290b50ab74364f991a6f7914c4 SHA-1: b337de6732ee88b801de5ac887c5154a40f97f63 SHA-256: c36c9ed94880f6496eca885530f376f421cc71c222c5bc514404a4148ebfa4dd
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-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://jottigo.ru/award?keyword=conduction+convection+radiation+evaporation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459636/normal_602d3c47dbbb3.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/nutubijovitenipunufam.pdfIn PDF document text
    • http://fagilef.getenjoyment.net/5488213982.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/latitudes_1_cahier_d_exercices_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366652/normal_5fe427460eff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_60598a7f91f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600b3f500e8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_603bf24e0536b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369143/normal_5ff4f70ec1d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_6058dfc85056e.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/descargar_los_rios_de_color_purpura_2_latino_mega.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/antisepticos_enfermeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_603c76ad2396a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/xumabozolig.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/68054973288.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/learn_python_tutorials_point.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/simple_addition_to_5_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/mudegejaxumagagif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac147736-cf4f-4f0e-8800-67d960b6d33e/boy_scout_camp_medicine_mountain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e737dcde-1be1-40d2-81b9-1c1c71ccb47f/44879783337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866f26c4-54e3-4c03-a40d-841dc42c10d4/words_to_describe_a_touching_story.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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 4904 bytes
SHA-256: 589b2b603cbad6d3e9e1431b5d0800a7a75ea4fe23824cf20dbbc5e9bccce721
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10772 bytes
SHA-256: 07e1d11bccee294d3e1cf9783d098682fbd9827af55b91ebb0560cec3f2983a2

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