Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f7e7fea647beef…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 02:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61130a17708c0e6cf423827ba17ddb44 SHA-1: 8b075bb51d25c165fd6f2db5c7d4933d6892622c SHA-256: f5f7e7fea647beef7512610ced0efcdc0b25f2312575f04c12c3749dae43e11d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the heuristics strongly indicate a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=aplikasi+inframerah+android PDF link annotation
    • http://gradn.ru/uploades/fckeditorfile/21168577865.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/dazazozasugofega.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/64506892401.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/96961645762.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/zonesenuzo.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/77974869240.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/59537963812.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nejezawedibimo.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/5481382918.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wagegetoxovuwok.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/34685170042.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60909341793.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/volizokemod.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/72956141816.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393e7656dd4---bovativev.pdfIn PDF document text
    • https://heyratacademy.ir/file/kudenagafilodojazanixus.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/sofomomelopene.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/72677469496.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/mutopovafi.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/saberojuvugesovefow.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/77205664355.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_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 17104 bytes
SHA-256: ab0804c4853ff785f2e53b7b80be98646fc2ae8f1c951438fa968e4c3bd31a59
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10736 bytes
SHA-256: 753b2e7da280df178dcce9fc3661c07c7bc197185c9a8ae07c9eea01f1e638bb
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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