Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fef5e64573f01f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 16:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 921036aabb435092751ca356ab589c4e SHA-1: fc956c197d9f39d9a2f9c79cb8ad323ec025f6b3 SHA-256: 59fef5e64573f01f368abdd9c6b2e013635f8977be557b1e6c25c5a42fa353c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting a tactic to obscure the true destination or spread malicious content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=happymod+apk+installer PDF link annotation
    • http://alanaf.ru/userfiles/files/17413227773.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dirabitogugibur.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/wupowupetuvol.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/sawajuwul.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xusizabagivevilesirexoka.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lazorolexiwix.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/41067670676.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vawutomuvapafaxaponuxipu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zudetefarazuteligozeluja.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/kajesilurir.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/2524668399.pdfIn PDF document text
    • http://superazs.ru/images/news/file/banomidadanegasisim.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/27999776571.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109190447475054.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/29313022676.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/90198216587.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/mutapukam.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/24349139592.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/53652339724.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/wevokurozemi.pdfIn PDF document text
    • http://standardamulet.com/files/files/dotofoxotuvutifag.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 17604 bytes
SHA-256: 430c9a86c95cc7583564fa05fbad1646b2ac8dc44d78194c1d3decf3dabeb8bc
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 10748 bytes
SHA-256: 0ceb3396d85beb59c1fda0c375faf64d13752cd39ca5ae1b94d966dff89850dd

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