Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90961ec75e16299…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 01:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c868aaccbf7cf20b3bb4e1edca01961 SHA-1: 9a393cfee9de0cf2eac36de53d8ac368f57fba53 SHA-256: a90961ec75e16299501e2770275cca841f85a7694723a4150acbe314b944151b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest this document is intended to lead users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://houselandia.ru/files/44336978870.pdf In PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jifedukapezemotuxotisu.pdfIn PDF document text
    • https://jagominum.com/contents/files/60077856512.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/17981945749.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/39968746777.pdfIn PDF document text
    • http://air-ned.com/uploads/files/71467166820.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/fokekosefidefep.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/63242020973.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/kifawova.pdfIn PDF document text
    • http://hidramaco.com/files/files/86056741815.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/80932450299.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/44485045940.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/44025226282.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wamepefunuvegozamate.pdfIn PDF document text
    • http://stisk.com/file/97641327509.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/11223540328.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jutasuw.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/roxisepowabodesaxuvota.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/64921710764.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/448602d17e7da46ba4baf75040a12ce9/xinanemeref.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/rufiwowufotisotatidizoj.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/14732676745.pdfIn PDF document text
    • https://brakos.it/file/92718896129.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/romaxawiwanipugepumip.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/jabogolemov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bully+apk+and+obb+free+downloadPDF 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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10716 bytes
SHA-256: 48d52e5771f3964b3437b04e4c57f1d3024c4d76c9acceb8948a0f3b32e684c5
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 17832 bytes
SHA-256: 4da3e0ad0b463a1e929055da06cec35104b8e06b9cae00732fd260de23c683a3