Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b803da614261d8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a653619456f42e464d43e88904d67606 SHA-1: 507d2f9dcd0020e28d8e8de36294cbb83df0395f SHA-256: d5b803da614261d8ef4dfb9b17fc9611151a5d2f6ca29ae350fb7ceb105bf6bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malware. ClamAV detection and ML classification strongly support its malicious nature.

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://garglob.ru/uplcv?utm_term=android+quit+application PDF link annotation
    • http://fiumevivo.it/userfiles/files/98347175767.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/jubara.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/78979150456.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/87556724641.pdfIn PDF document text
    • http://xanbiente.de/userfiles/file/14400602240.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fenebafejulepugikurat.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/migugibodute.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nomurovekuleruva.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/68520535963.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/putamivezevuzaxa.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/84324932992.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vunajekefexigazawo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/6854831302.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/42666471152.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xetimeviwur.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/814724695.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/10139863448.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/91064523347.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/womuvazimimesasi.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210909_4ECCA566178954B2.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/kimepakapifutevega.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/67050581004.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/35438953040.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/tabevodajukelakaf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409330ba227---losane.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 18036 bytes
SHA-256: d52906c979c1ead4444c85a0c5bec54fb64662b3a468657d14c5a1556d26cd2b
font_01_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 10432 bytes
SHA-256: 4832b6d1a333c6e4a4a262ec2ef51c798fe00cc2c20f2e55795fb5f04d3ea79d

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