Malicious PDF — malware analysis report

Static analysis result for SHA-256 8027ba4c5b25c8ac…

MALICIOUS

PDF

78.4 KB Created: 2021-06-04 07:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 74c2343dc19a51c84d1e96fa0d52e79f SHA-1: 53db1787d0de2a9b5b8057c7486a2f1e70283a9b SHA-256: 8027ba4c5b25c8ac37911b6bacb12006a7d2bce3eed06ff3529b85b58faeae83
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/pbw?utm_term=dell+inspiron+n5050+wifi+drivers+for+windows+10+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6046ddfce1b6f.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/zadelunowoko_wugujim_lobegemunez.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/f9a9f7794828.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/foravaritozekoveduz.pdfIn PDF document text
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/pususulasukujuxi.pdfIn PDF document text
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/3495967.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421341/normal_60b3c5100cc96.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/d5fbbfcd41e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144540003/anonymous_external_attack_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b658c727-f0c0-4522-b692-2fa834a24bb5/how_do_i_write_a_sponsorship_proposal.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/libro_petrucci_quimica_general_8_edicion.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144497184/gta_5_the_merryweather_heist_stock_tips.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/topematarekagafokefirab.pdfIn PDF document text
    • http://bezagodo.pbworks.com/f/11083715268.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/how_do_i_write_a_performance_evaluation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4072e9-7662-4c01-9335-e686fb66007b/91630148742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add06b46-3a05-4fd3-b3eb-f9789caaa4a6/34805210626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64929853-a9a4-437f-8e6f-ae934f68057b/cheapest_fly_tying_materials.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144562806/how_to_reset_filtrete_3m_thermostat.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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 5676 bytes
SHA-256: d6c18a021de0bc8855326ffb679b3f24403e7d6a73b4c426557b96b146e45152
font_01_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 11680 bytes
SHA-256: 4b983ca46c5317dc9d038bfc56a0223ed4b67d6f248077ecf33731d4bb0253e1

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