Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb83cefcc0124c7…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 10:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76b955db4df577f3dd9d15d08f6ddff5 SHA-1: 3ea103d4099432e1ed3dd692a4982ced380bcf15 SHA-256: 1eb83cefcc0124c7e6db4aaf4e3e9b71b48d720f2eb5d66b3668542e94c67bde
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 0.9997

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://jumiwimov.ru/award?keyword=linux+administration+training+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412767/normal_6001d05610d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416494/normal_5fe2640d71afa.pdfIn PDF document text
    • http://chambrely.xyz/33506876857acoso.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/85838088882lkd8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_605501df5ef1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_606508cb45be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_5fd88cff3c55a.pdfIn PDF document text
    • http://itash.space/kurt_lewin_group_dynamics2glml.pdfIn PDF document text
    • http://axecheat7.xyz/troy_bilt_mower_bagger_partshvh2k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387421/normal_5feeb4a0d7c9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5ff21fb1ef2ac.pdfIn PDF document text
    • http://buyfastedcircle.xyz/pajama_friends_sub_indo_ep_10eifnl.pdfIn PDF document text
    • http://gouliwer.online/v_shred_clean_bulk_program_free_downloadf1e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_60472ae8f0837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_6019dee0789fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_604e3980c3b1f.pdfIn PDF document text
    • http://goodsun.fun/certified_ethical_hacking_v10p360q.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/air_source_heat_pump.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumomevafuvozup.rf.gd/avast_cleanup_utility.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_369c9fba9329422ca0d3f9b16bd81c28.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_285b05d31799430a908dd81d53e00e99.pdf?index=trueIn 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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5336 bytes
SHA-256: 7ec0b36558d0eddd435b2bf4e540c20e61f67a228809c9223a548a2f990c3e99
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10364 bytes
SHA-256: 6c6bf3f95d6c7af9e04be9e95651875a7343fad3ca820af90de98b15a6fc3799

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