Malicious PDF — malware analysis report

Static analysis result for SHA-256 296dd997b8c1c3a1…

MALICIOUS

PDF

75.2 KB Created: 2021-02-21 10:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5d1f829a86dfd1d176a757c407498831 SHA-1: cb41936f7498248e6f8870f8b79ca56415de050b SHA-256: 296dd997b8c1c3a130bd5bf46b99b11c2c9c2f9e5ab06581ad6c93ea1977e45b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, containing numerous external URLs pointing to other PDF files. These links are hosted on disposable domains and appear to be part of an SEO manipulation scheme or a distribution network for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=the+solution+of+the+differential+equation+%25281%252Be%255E%2528x%2529%2529y%2528dy%2529%252F%2528dx%2529%253De%255E%2528x%2529+when+y%253D1+and+x%253D0+is PDF link annotation
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/aa8355693ec6f11.pdfIn PDF document text
    • http://mivetys.xyz/t_mobile_5g_home_internet_coverage_mapl7oh8.pdfIn PDF document text
    • https://pabalosuto.weebly.com/uploads/1/3/0/8/130813917/7909163.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/vifipazike_libito.pdfIn PDF document text
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/7758981.pdfIn PDF document text
    • http://nefritthebestthing.site/81975993352tskoi.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/3178565.pdfIn PDF document text
    • http://nesobaka3.xyz/andy_offline_installer_32_bittnom7.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/lebag.pdfIn PDF document text
    • http://lngcliente.com/nezezeso8y9rn.pdfIn PDF document text
    • https://dasowafajego.weebly.com/uploads/1/3/4/7/134723411/8337624.pdfIn PDF document text
    • http://reform-st.ru/73805263790bs5c8.pdfIn PDF document text
    • http://yachts-4-sale.com/bhagwan_ka_photo_ing_karnasdipl.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/7idighc/warpaths2peacepipes_crow_tribe.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/2171391.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/jazofi/noxidakexixesuxid.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/zuwopupokuloxereru.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/fewitiba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 5812 bytes
SHA-256: 4729a22aee15b8a5a386cf981aa7859d8f4075eda94f48f9bf3b064862679cb4
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 11108 bytes
SHA-256: e90741cb5fa488bf4cd9f79434447e6886fa11b709ad07782568648cb83e266b
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16184 bytes
SHA-256: d3d1489fd513f8bee595dbd56263503e191e2c836c0567e30dab370bc0ac0945

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