Malicious PDF — malware analysis report

Static analysis result for SHA-256 9684bc49e79f82c0…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 14:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b796b69e01a290374870004fd8e61670 SHA-1: 3afae8a440702c525ceb6be7f4fff029fbba26d7 SHA-256: 9684bc49e79f82c0104cc7f93f0ea889ed6c99aae317eed17128ab547d6524d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=how+to+keep+lock+in+phone PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b2d350ad---pedelisevagebaf.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/rotazuvalumi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/82386444811.pdfIn PDF document text
    • http://robedecreateur.com/img/files/zogorosunofusox.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/81726956363.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sikuvetewejepabujixiro.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/71766841140.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rixedikolikonos.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1b42fd24---bavedevadevor.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210918084324.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/kulutozepobukuzifivixe.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/kosatededo.pdfIn PDF document text
    • https://digireg.sk/upload/kizoterukomojaxerinoburod.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/50949656144.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/48270775560.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/59676756094.pdfIn PDF document text
    • https://iword.de/userfiles/file/2844625260.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/517851958.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/72458581610.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pibexeviluxotewinibevin.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/sugirox.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/zipatofi.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/27482505932.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/66579468805.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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 15660 bytes
SHA-256: 4faf894b05f80b200b74fecd7a1c973373e7bcf6ac3a8cf84833a815c05760f1
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10212 bytes
SHA-256: a09f9ab2546c600f0e7eae5295cff794c75c61402aaa0b6c62c7e93864913f0a
font_02_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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