Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b873ad80c32aed8…

MALICIOUS

PDF

93.7 KB Created: 2021-09-16 02:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dbd153c27aa51e3494245dbf552d339 SHA-1: 958551fbebd78838513ed71f358b7d958252cc43 SHA-256: 5b873ad80c32aed8616b48652fc5de57fdd0b033699e99c300197d3c423fd6f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate structure for link distribution. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://philabc.ru/uplcv?utm_term=media+storage+android PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/lezuwubanerotalufigapi.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/69302894654.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/xipukowas.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/89877216998.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/lebege.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c91a25a1e---tudafovodenezi.pdfIn PDF document text
    • http://enricobarraco.com/files/wutoxizavavimaliwadomuvor.pdfIn PDF document text
    • http://valeneighbors.com/userimages/97121956246.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb01e4c9---dibuduzumogozapagagonuxa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/95579422777.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/minub.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/mivogavolole.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/falajuwikiw.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/71284699888.pdfIn PDF document text
    • http://clerus.hu/files/file/37567516756.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/14718792981.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/69181068639.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/molonixebabowelenepe.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/32585934464.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sikizeferarukeburejebez.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21100511024.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/80403287295.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_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 18832 bytes
SHA-256: 4b0103543258ae1a37078dadccf844202c6e3daba338556e29c4dce04282f697
font_01_sfnt_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 10368 bytes
SHA-256: e2556195c5e7d7d7b2687a9489fb592f783f8c529590b7f7a96559ed51c3f1cf
font_02_sfnt_off0001516a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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