Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f28b9e2e14ab5b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 11:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd7fed996958d6a5eeb5723f651f6e4b SHA-1: 334966494c4e6f17e68704c2a14e53eca4be5e35 SHA-256: e8f28b9e2e14ab5bbe6f57fcf66b085234d10330ac6c12cd07ad9878b9df4c07
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The 'SE_QR_LURE' heuristic indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=android+phone+scan+qr+code PDF link annotation
    • http://td-mg.ru/uploads/files/texipexedu.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/vivivuzeruvu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/nilomavos.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/rebunogolapaxawema.pdfIn PDF document text
    • https://clickbox.ro/images/file/75439368296.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41594222268.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96222751720.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/76255210048.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/9096785027.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2a616bc38c55268436ad60f3e63ca6d4/54938700677.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/55469426284.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/nowox.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vibijutugeterudumamelaju.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tulepexawudajafenas.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xobivobesanavuzoxuli.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/rilupazewinedut.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/47864179336.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/70821569869.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 18104 bytes
SHA-256: 74209f79c52d96a7a3f5c8d74f109439dcca95d4e5ce941501c9dd9ff2aa94e3
font_02_sfnt_off00011829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 10592 bytes
SHA-256: 10f76dfacf22ac1d2b63c1e113b432521c9d5547ba9759ac2e5ccd21b412ce56

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