Malicious PDF — malware analysis report

Static analysis result for SHA-256 016887b52024c952…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 13:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa4e09ea6d12f6b5c3f32b4fd4aa204d SHA-1: 898efab8f307ab2c876a709dbe349f897f74694b SHA-256: 016887b52024c9525d52afd1b0cbef64c9c3981d8d3f54dd3c952fdb9cf0640c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

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://archism.ru/uplcv?utm_term=before+you+quit+your+job+robert+kiyosaki+pdf PDF link annotation
    • http://www.hebrewforreadingcomprehension.com/content/fikofijuligova.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vesogiletosevutazivopozaz.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/52694074487.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/20967066777.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/99911927065.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/varilejivel.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/guvipo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/21582238983.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/36867067269.pdfIn PDF document text
    • https://anakmeong.com/contents/files/1584348770.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/japebemomigofif.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81082408263.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/xejigizudiritirog.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/44266337654.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/17721796971.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4489159707.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/82849611943.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad334d02f---bolakoxatexonega.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/ladatizomugawisub.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/29878435767.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/bojojazelolavekitifigi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/naviza.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/gogobuvuxewo.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/99571128540.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90785704979.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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 18804 bytes
SHA-256: ab45396dd146a6f3b1555ed40c409a5979349af63f0821eacb2efb98d3dbfadb
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 11116 bytes
SHA-256: 43224cf156495ed829415daf0b687dbf7f3de8abb6da690e5b446a02ef821340