Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ced9b21ff1571bc…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 05:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8e5344bc0e285376bafb18ac73825aaf SHA-1: a106b81725a108b68281faf7bf3cd1811270c49f SHA-256: 5ced9b21ff1571bc5816e6754f62751e255d5bde4bec691e71d95832152dc984
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many of which appear to be part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=hd+streamz+aps PDF link annotation
    • http://www.amedna.com/userfiles/files/73481100129.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/demadavulovezobo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_171016.pdfIn PDF document text
    • http://decorstore.eu/upload/file/59207181658.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/jogipedanafig.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rebarunujaporilosa.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/66177456187.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/49052838605.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/danubumimibalejusoz.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/satafubugitar.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/96981540911.pdfIn PDF document text
    • http://kotolantopeni.cz/file/12593590742.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/69566018439.pdfIn PDF document text
    • http://greenbrier101.com/userimages/difiwujewa.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zopuwagivixera.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vazirisumuxevel.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/74476803193.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/xagoxarasofuvit.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/rivuburifes.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/30029190080.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/35555955930.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xoxijakog.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/wiwotejuriduw.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/tururogidezinun.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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 15256 bytes
SHA-256: 48d60fd43aa124b17e104651e34eb88f51e2a56b262a683a6322badbf5dc69bc
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10244 bytes
SHA-256: 9ff3d77dcc0fb9ff9ecfc4d047e2c1feb4bc329887dba69f410c62c528e1a66c

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