Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9482f422eacc0…

MALICIOUS

PDF

77.2 KB Created: 2022-05-28 18:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 406472f74399ccdd5cc4f92ae1e5a270 SHA-1: 7501bd103ae1d9b9b3c238759b642fd512f120b2 SHA-256: cfe9482f422eacc0a788856a028a04276dbc78fd216f2f395a79ea3543d674a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary lure appears to be a fake 'physics book answers key' to entice clicks on the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sunuf.co.za/YmrXLWy8?keyword=spinning%20mass%20on%20a%20spring%20mastering%20physics%20book%20answers%20key%20pdf PDF link annotation
    • https://lijagetasigu.weebly.com/uploads/1/4/1/6/141604956/5830975.pdfIn PDF document text
    • https://pepibugogik.weebly.com/uploads/1/3/1/0/131069762/8f24a.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/supovovise.pdfIn PDF document text
    • https://kudoxere.weebly.com/uploads/1/3/4/5/134591480/20dded.pdfIn PDF document text
    • http://helppakistan.nl/cmsimages/file/28465952371.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2022021612512673499.pdfIn PDF document text
    • https://xamotufa.weebly.com/uploads/1/4/1/6/141680470/zubezamutimozetuwa.pdfIn PDF document text
    • https://gejixivipoza.weebly.com/uploads/1/3/0/9/130969358/3c326864ed3.pdfIn PDF document text
    • https://kikunuwip.weebly.com/uploads/1/3/4/6/134687028/7597388.pdfIn PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/daxikig.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/sezoxudawomu.pdfIn PDF document text
    • https://gebijakirapasu.weebly.com/uploads/1/4/1/6/141632634/kesozikudolu-sazafevogulire-kiriz-befisudeziwu.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/tibebavavaludeku.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/5022427.pdfIn PDF document text
    • https://residencialparquenorte.es/kcfinder/upload/images/files/rawexo.pdfIn PDF document text
    • https://pefupofavuxugo.weebly.com/uploads/1/4/1/2/141249676/bonolixidiposupegum.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jirajobimiduwup.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20220426_7ED50BC1FE53A233.pdfIn PDF document text
    • https://jobs24live.com/justjava/web/images/fck/file/31719682280.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/natuzosunovuv.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/19878513835.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/8063128.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 11528 bytes
SHA-256: e641cf46af76e32d289c2c92b945ee5a88ad33e4349cb13034775f2a5088997f
font_01_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 17384 bytes
SHA-256: 01e9a2fdb1152cbb95931cbafa90d48e780b2c9c19cef01c1e4f05135d99263c

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