Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89ee88620f3f5d0…

MALICIOUS

PDF

75.1 KB Created: 2021-03-25 07:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0c3ac76628212c12466344ef63a4127 SHA-1: 90a042906b60b18aa784c9260facd5dbdfe02192 SHA-256: e89ee88620f3f5d045b4b33203610ac0810e2e2b6fc4239adc9afa3eb9ae205e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, with the primary URL suggesting a lure related to a book title. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing or SEO-based malicious redirection campaigns.

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://druttle.ru/award?keyword=algorithms+in+a+nutshell+2nd+pdf PDF link annotation
    • https://lokejarezuwomi.weebly.com/uploads/1/3/0/7/130776656/sakumixoteti-jawomaxi-polepatenojod.pdfIn PDF document text
    • http://boomerangoo.site/how_to_dispose_of_empty_epson_ink_cartridgesirpe0.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/c55308b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fd7df90a89b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5ff6a60e98799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_60117c9e6ee05.pdfIn PDF document text
    • http://vitalia-transports.com/13261397911ntam3.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/jagita.pdfIn PDF document text
    • http://intereriia.com/basketball_world_championship_20208zisu.pdfIn PDF document text
    • http://idealica-tufficiale.website/hmp_maze_prison_escapegtwlo.pdfIn PDF document text
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/kasabixazogelak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_3b0983c431124d8caf42ac78a5899595.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_3e8b181793374e9496b61209c3d139e3.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_728e4ff5eec14cef84dbc7030637153e.pdf?index=trueIn PDF document text
    • http://filosoko.onlinewebshop.net/73512389985.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/toddler_bed_flannel_sheet_sets.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/25540015795.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/bootable_pendrive_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/welcome_to_fabulous_las_vegas_sign_template.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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 5576 bytes
SHA-256: 25f501ca594324089b13fee15ae7f5cafcabb23edfc0e5ce2e11b49adf08837e
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 13028 bytes
SHA-256: 8692de17916597aec559e6f86f4fafd004f607f008d38d0ab8851cecf05c5e0a

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