Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5572d26d314a53…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 15:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e111e9958570e4f9ede0dd712c3f474 SHA-1: 79145a009c3c24df608fcd9e59539a301bd22607 SHA-256: 5a5572d26d314a533f88687a7525e9012d595d6754adc42949c7d30c0ee8458c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to unknown PDF files on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate malicious intent, likely phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dadepevafugodofit.pdf In PDF document text
    • http://machulski.com/public/file/62276555017.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/vewaxij.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fagigurepukodokor.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/menuwibeguwi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/77375823816.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wifuvujopixolarik.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/vagab.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/jixir.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/6672963261.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mazirufizevivubiro.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/kojemipoxiguzevirigukok.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79782761268.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0e4bc526---5646662061.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/dumilekororemeseboxisef.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/36910432824.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914034602_td7ny5.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/denogofakekimojuj.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/78200760504.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/zidefebukopuluf.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/liritodazenemuv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d290a34bd---13252810995.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dipaxolef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=short+stories+in+french+for+beginners+olly+richards+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 17516 bytes
SHA-256: 217b97370ccbcd862715d45dc4f3b972276acfa601444522d256314a4f8f05f4
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 11228 bytes
SHA-256: 711c0d0e3734c30f506cce0673d791abd5996a3a35a5765560180dab042400d8

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