Malicious PDF — malware analysis report

Static analysis result for SHA-256 57045c5f52872687…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 16:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66b2186c040687b0284097bf02e0bb46 SHA-1: 5d3b722d7f1c0815634ee3ee57811e843aa93094 SHA-256: 57045c5f528726875d6156a5a1369be8a09d8ed620732773133e47078a3db6cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://daithanhnam.com/upload/files/butoximaruwi.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bemakebalamafojunujog.pdfIn PDF document text
    • http://ruihuitax.com/files/file/vepisotowokosedija.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ededbd0cc---meluvutamobesoz.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fonuwogawokatemizukobe.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/kazosodituxebedepudenog.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/94617638058.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/12831656471.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/46878543276.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536aa56767---tikazovigokoro.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/jepopa.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630627008c7e1a8315717a9cdd8fd.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/wadavojed.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jekibobajaxamise.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/zuzizefizupama.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/11088292839.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/36043276662.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/12782067886.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/xokukovijug.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/supabopufixanakijuge.pdfIn PDF document text
    • https://coevent.ru/upload/files/woginiwumosimomimagog.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/50904505053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chamberlain+garage+door+manual+pd612evPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16480 bytes
SHA-256: 0d2d5a5b71e3da17eb5a90df97e756859184fc9ef48018ba28f4e517dd735503
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 11248 bytes
SHA-256: cc73c4a4b49541d70f2f7caf1ea6966f27a003b14062d9f97af806bae2013659
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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