Malicious PDF — malware analysis report

Static analysis result for SHA-256 541f2f6cfa16b13a…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 11:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 43226eac8b38f0bb020c59c1b75728b7 SHA-1: 53d574fd8179b6e2743334109c248c7eb2cc2ae7 SHA-256: 541f2f6cfa16b13a9205280f02d30955d4e1d24be618911c0d62c6d3ffe13a74
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 0.9967

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://kuzutuzo.ru/strik?utm_term=maytag+2000+series+dryer+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413242/normal_602db19556ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5ff8b7f0654ba.pdfIn PDF document text
    • http://profmaster74.ru/5018557102vw426.pdfIn PDF document text
    • http://kkkirrreeee.space/nafusunifizulepelumq1dj9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fd087fc62bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6056e4441cef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_602dca20c2ee2.pdfIn PDF document text
    • http://umniashka.ru/176579618278aidp.pdfIn PDF document text
    • http://meetly.space/75928031817nkd5v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_60482ce1c9131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_601ee99e0ea3e.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/how_do_you_fix_a_unbalanced_cabrio_washera1vvn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fdddb14cf7ad.pdfIn PDF document text
    • http://raifaisentapp.online/project_management_software_ms_teamsfafwp.pdfIn PDF document text
    • http://qrastenmap.online/jugumemoqs5jx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_600fdb626a35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_6026a3107125b.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/aol_app_for_ipaddw1gy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5fefa9c30c33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_603bd9f381c6f.pdfIn PDF document text
    • http://ru-payment.casa/70100673557ne2rk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fec99f1403c7.pdfIn PDF document text
    • http://profer-opt.ru/lupokomapotnenxr.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/fizup/south_movie_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/21329594911.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/audience_and_purpose_statement_examples.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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 5496 bytes
SHA-256: bd0851d387503714dc4ad79f84d93f488b864d814845172b73a6b3f2b9e6c8e3
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 11156 bytes
SHA-256: d928b726f2dcaf0a19190fda20e43ae2e91d729b2083bba277dc006fd2874133

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