Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f408e649350906…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 01:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2d871e5260108b744ea6b838c526535 SHA-1: 8a5ed9bb635a59177214d482512146e36afc0cde SHA-256: d5f408e6493509065e8304f7e1d4517fee851673266d206a350a52b1590f19f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=one+plus+new+update PDF link annotation
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/52421297923.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/rikasemobu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161422424dc73c---79926948188.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/fujezonowebadoxobuxozafi.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/19639739758.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/11365667863.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210919165258_907779008.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/62974644526.pdfIn PDF document text
    • http://okun.su/upload/file/fanofire.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/diduwubi.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/68318667319.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/xajurolebep.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/bazejenajilax.pdfIn PDF document text
    • http://www.pvvc.cz/files/56909602226.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/42211207542.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/34983618353.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/gixitim.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/79088479897.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/weroxa.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/kemarowupa.pdfIn PDF document text
    • https://people11people.com/uploads/File/2901833454.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rulodutosa.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210915_140930_130.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/54589806975.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_off0000b104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 15732 bytes
SHA-256: bd6e4fcdb40e2c77f338973737218e445cad28ee6bc1950be1398d2db097ac4a
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10284 bytes
SHA-256: fa9c8b4b8965d8cbcf3b05cb10f0fcb42457adc232ac66d41ed28cf43da0b325
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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