Malicious PDF — malware analysis report

Static analysis result for SHA-256 f049382ba91f9a0a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 07:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28d6965677b2bd86d95ae058e2312f64 SHA-1: 89f4d3deb9b53769f7a5ebee93abecf2a430014c SHA-256: f049382ba91f9a0a08bcf30723ff859902ed66a2ca3fc456d9fab5e6f87b8e62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment.

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 https://allytemp.ru/uplcv?utm_term=tango+apk+2018 PDF link annotation
    • http://siciny.eu/userfiles/file/14590037671.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/29151737983.pdfIn PDF document text
    • http://yibetter.com/data/files/45937504275.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/27104552131.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bavogipufimu.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/70261642827.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/sulazejulufuxisagofuleker.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/50587846271.pdfIn PDF document text
    • http://muszempilla.com/files/file/vuvinurotaminaminegufur.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/99987256262.pdfIn PDF document text
    • http://trubaopt.ru/content/file/wipuxomazunovupomeji.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/talonadimukanat.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/2754757728.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a2163d0c9204eeb806a50b2c2182c43b/piwugugotuzezanumunuxepez.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/tivutixaniwiboxexib.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/92710519404.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ntedpjku0ijhjfrgdr1nq23q30/xiwibiguz.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/mififejar.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/semadewejafukulalusidex.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/vanusexizinuvebewisomanez.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kutamekadowisizunebugo.pdfIn PDF document text
    • http://creationart.hu/files/file/nivolubajetum.pdfIn PDF document text
    • https://rajaunited.com/contents/files/sikazedowezapon.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/53589413347.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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10348 bytes
SHA-256: e870bd5da8eb628ec7838c7619adf09820e57b05eb6345be2052a75e053ca5ff
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 19524 bytes
SHA-256: 7f045e62345be4aab4180797ebabd48c1d6334b37a3ba7de982df6c34becdeea