Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a586efe2c957dfc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 10:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffcc0d3d44a750d76dc69e07158e2c5d SHA-1: 90bfaae4237ebb6fc4eb4908212916f599ea62eb SHA-256: 5a586efe2c957dfcbb3bb77cd9a53ea030d301151680c8e9382488d3222ca721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external URIs indicate it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=where+can+i+watch+geetha+govindam+telugu+movie PDF link annotation
    • http://hotelgiottotorino.com/userfiles/files/tugizidiguliwuba.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72049562322.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/59874122716.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/79229494596.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/72934984592.pdfIn PDF document text
    • https://cityface.cz/res/file/tuvepuwamedamijejewet.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/vujugegawakewosewibos.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xazoxibufesoguvalazegesu.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/91184306299.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/dubidujanamumirixewu.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/86430239331.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/milokimujenitutozuwon.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/30823847501.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/goluwuvobikibotorun.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bf39efe4adb1770ec05ed3ff76adf34e/3591563274.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/15141431366.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37641407830.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c4f73eba---74293758120.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xowunitemevosa.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/53459538424.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/golovobusunoru.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/90130104549.pdfIn PDF document text
    • http://bociany.sk/media/file/56426596457.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_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 18840 bytes
SHA-256: f0818650eaba6e3dcc416da5e20815ce0f3cdd0f853875c876e64bd03b0599e1
font_01_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10892 bytes
SHA-256: 458a856995ae6248a41c77e82b5ed033ef2ef04c7e3371d2833169ac6bdabc41
font_02_sfnt_off0001438a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1