Malicious PDF — malware analysis report

Static analysis result for SHA-256 572d8640341e7f1f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 19:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25fb0891b50964f802fcef29b0b77ce0 SHA-1: 416e673d0fec45c79242712780f8a3d7d65b9ef8 SHA-256: 572d8640341e7f1fdfd9e1f0627d1afc8d2aff87bc870004e1127c4656f2fec2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+restart+xperia+without+power+button PDF link annotation
    • http://tokyo-sanritsu.com/userfiles/file/tekem.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/ziguwetesukixemapano.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/koloderuxa.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fobusozenupegisakanogekes.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/86181377824.pdfIn PDF document text
    • http://coffee33.ru/archive/file/44871091637.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tasusuxijo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/65576993158.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/mukup.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/puparegolizigogagidozinid.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gimunomijepavaxeruzabu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a678330f96---99875112467.pdfIn PDF document text
    • http://viorina-deko.com/images/file/potunonurokopewajisa.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/62897218758.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/246486451.pdfIn PDF document text
    • http://umhouses.com/uploads/files/55723124735.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c04782c54873877d1626cece5588f4a8/39798651141.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/85932754891.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/43556607878.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zakuranomap.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63325106928.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/58264284528.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 18204 bytes
SHA-256: fa11cdfa9f0157ef6f2763356c71577f1300a296f9408348bd00e86797a510c8
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10720 bytes
SHA-256: de91513fb2b317345a5e69e00362b4bea0ea30adb5464e9c8a657a2f1831c742