Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e6dcaf96bdf438…

MALICIOUS

PDF

92.8 KB Created: 2021-09-15 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60712719cdc0f0de67225a9a639c8381 SHA-1: da34e65b6eccf0214290756b59445a0c42dfddbd SHA-256: 30e6dcaf96bdf43893956f4266a16a1883ac40778a65b2fd951140f80a7aa6a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that redirect to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=google+and+android+apps PDF link annotation
    • http://lso-msm.fr/userfiles/file/25032572377.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/diretokibesudugavaduz.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/15696540144.pdfIn PDF document text
    • https://harmony.im/userfiles/file/babobudutixalekexe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161332ef256057---35058222636.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/80506361816.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zowobusufakefafow.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210908_4C6DD930E12DBA66.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/51158496093.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/puxefowan.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/pigiruboxomagimow.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/80534547868.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fe85619c73aae192e369869d3d25a17d/gelarugelapofasuz.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3005508514.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/99404097180.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/wisonugataliwopu.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45675620832.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/79024221487.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/46743717513.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/6058843040.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/zuvowafopuwej.pdfIn PDF document text
    • https://digireg.lu/upload/jojamafutaxarudobidabuvap.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/mezoxexebuzijuxamef.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_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 18368 bytes
SHA-256: 484134f37a95c1f8f561d312e03b1f92bdb8173821dc2d05717e83594edd5207
font_01_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB4 10508 bytes
SHA-256: 601b8ac4306413e19a8b4b16b0438bcdaf24908bdb25ca4265dbfe3d39b8868e