Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae517a989ee09f2…

MALICIOUS

PDF

76.0 KB Created: 2021-06-01 19:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5e4932f138417f61c72a3bdf807556ad SHA-1: 52b1d481d30babc643ed183308fed8ea1fbb78b1 SHA-256: 5ae517a989ee09f25f6796ebb7268b0e20b0ba7cc99c1f7db66a64d0267e1c40
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9995

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://zajinet.ru/123?utm_term=b.+e.+a.+r.+d.+s+regelwerk PDF link annotation
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/pogozudaso-zuxawibodezisi.pdfIn PDF document text
    • https://lefipejime.weebly.com/uploads/1/3/4/6/134668800/5755720.pdfIn PDF document text
    • https://ruzisatof.weebly.com/uploads/1/3/4/7/134734885/5404145.pdfIn PDF document text
    • https://kekipunoze.weebly.com/uploads/1/3/4/6/134601808/kojimib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_603598fc46012.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/7433530.pdfIn PDF document text
    • https://kudigebudubug.weebly.com/uploads/1/3/4/3/134353201/9551000.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/af80bb3078a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_600a73b20dd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_600b67f61b659.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/rofopafed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb0477e-e17f-4fd5-9c7f-9b972c562cad/moliwonozuvurukej.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/how_to_calculate_punching_shear_perimeter.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426147/temekaz.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/turkey_meatloaf_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0ca6bf-06a8-45ab-9db9-837558bfa8e8/31479194062.pdfIn PDF document text
    • http://barumena.pbworks.com/f/50801922713.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/witcher_books_the_last_wish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fdcc96-0323-4d8b-93de-a28b093d1358/does_lowes_do_employee_transfers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d83811-d32c-47fd-a77b-bed3e40d5d0c/how_to_bbq_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10a6c12-088c-4753-b128-0465982d81c4/29364160410.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/gobadagetibuwut.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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 5228 bytes
SHA-256: fd47f9e17d51059a86043a835b244dcf08d71236f1c356023a376521d612f84e
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 11940 bytes
SHA-256: 1590788faaf453e0149eeadd1d78d65d30e622ca7b2f7d41f63c32f67d0574fd

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