Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67cf940710b15d9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 14:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f773d5775d5faae4a256a5e11e13c55a SHA-1: 8075eb0e02a4155de35071d7afbe96471eb8c15b SHA-256: b67cf940710b15d97c78d2f91c3235c156b2c6c92f9c6ae4cbb36eef06d7cb53
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=dell+latitude+e6540+i7+4th+generation+review PDF link annotation
    • https://cdn.sqhk.co/depifozopupe/h1gftzH/rezijixobebubusolovifapuv.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jEicig8/communism_flag_gif.pdfIn PDF document text
    • http://lnstagramoriginal.com/549186555734iec.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/jiijage/doodle_basketball_2012_record.pdfIn PDF document text
    • http://igme.site/canaltech_e_magazine_luiza6hbcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fcc039413778.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/eYvhgRO/97859135597.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/jbFgiQY/kiravigevozutimukupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5fe601f1b1190.pdfIn PDF document text
    • http://lerob.info/vibujutaverolekageridqv3r4.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/cgheLij/65812912341.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/icsibhe/epic_games_redeem_code_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_60354e1b00474.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/vukumesoj/your_uninstaller_7_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/71299898170.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/rasebivotugoruxo.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_9d97afc4af354103aa6d45b752b40c00.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_1c1d423710fe420090b4a7d572feb79c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/12722710882.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/pre_algebra_worksheets_9th_grade.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_8295566f7fb9453b8c4df65ddc91ebe8.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_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 5648 bytes
SHA-256: fb09df861ac7710b1b06e43090430d7c3dec4ffb55495d53da06cabc1cebefa3
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10564 bytes
SHA-256: 1669aa5ad29bf751b77115d449b1c2a0851e3be6a8a94949b558c497fda704da

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