Malicious PDF — malware analysis report

Static analysis result for SHA-256 835c97acebb6c60e…

MALICIOUS

PDF

70.3 KB Created: 2021-04-01 10:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8c4f0db9b5685deb8b39bad345f6de2 SHA-1: 5b604ab8900025a6601ea791377ac553aaf3732a SHA-256: 835c97acebb6c60e0622be82817ec457b048c618efe6471014018e8af6ebb3b9
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 0.9991

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://botokaw.ru/strik?utm_term=baofeng+uv-5r+plus+firmware PDF link annotation
    • http://jagojurezowu.22web.org/76854669244.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/most_annoying_words_listu32a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/BJ5ibrE/hockey_meaning_in_gujarati_cinnamon.pdfIn PDF document text
    • http://interior.estate/idle_home_makeover_download5121q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498986/normal_5ffea22a8b241.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/gigdhiW/my_cloud_storage_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_605948f9a30db.pdfIn PDF document text
    • http://meinekarten.best/76928961526h33dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fd04e64e6bca.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/8wiigcH/96826304725.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hdjeDhd/kaiser_pharmacy_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/iegfhfs/73080861872.pdfIn PDF document text
    • http://imedo.ru/summer_escapes_pool_liner_15_x_4252d1f.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hfNiEP1/gewabexuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_6051628462692.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/banula/83024244071.pdfIn PDF document text
    • http://vawibafutij.rf.gd/95719714855.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/85591795777.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/norulaxijupebebugaratorok.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/rezuwiduso.pdfIn PDF document text
    • http://pukerobedu.epizy.com/27199190866.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/the_exorcist_tvb_cast.pdfIn PDF document text
    • http://wusujiko.rf.gd/buzikesikije.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/licence_alternance_informatique_lyon.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5580 bytes
SHA-256: cc82cae49b3d748b9787e98a5754e80c7f5e44314633dda310c0abb7bc8c4f10
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10536 bytes
SHA-256: caffabf5be457da0b42fafad0332ebb9ccd2dfba7056050a9bf89d49f468ff08

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