Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae9fbc7f39d4d9c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d46710716e1ed5170cb397a20657722 SHA-1: 3ee8df2ac3913cebc56dac0c1c9a4e9f7e087479 SHA-256: 1ae9fbc7f39d4d9c197569ee53032202737109205ad2e01f2fc563f7754a9537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding a large number of URLs pointing to potentially malicious content, with one notable URL being https://coretry.ru/uplcv?utm_term=fortnite+new+galaxy+skin. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=fortnite+new+galaxy+skin PDF link annotation
    • http://sibaco.ru/ckfinder/userfiles/files/widoximevem.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/mapufobokevasuzut.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/gegekotabujadipixize.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/rowefawafusegirozaderaz.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/96887585826.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/81131173120.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29984363857.pdfIn PDF document text
    • http://gibisch.org/files/files/40973132922.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fojefavonifidewudu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/79002405743.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jevap.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/zipod.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/sudobaxeguwevabiraz.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/fixakilafusi.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/53032633206.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64564073970.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/mujolumajozizusati.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/godosetanajoj.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/72838573491.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fewaneripudufegep.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/48235101542.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gavanu.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/gizalonujiguwebemesub.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 19008 bytes
SHA-256: f8778a85b2e4f2ea2a058089ba4dc3840b0306a7f4af1b6aace62a6672f9a1b9
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10652 bytes
SHA-256: b047f8fd92c257f8725d0d5540b849a7c43b6ffb786677d77546d0255e8046b8

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