Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b7da0c963b7d17…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 02:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 577791a263054ff405bd03c61f64103f SHA-1: 38a4022d66ee25c4db72abe91962f80a67b68912 SHA-256: 39b7da0c963b7d17af65c511d475635f828c8969dff4d362fef5c702b35d61f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=short+english+stories+pdf+for+beginners PDF link annotation
    • https://sanidom.pl/img/file/rajiwi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/43025217015.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/faxudirunozulutekagi.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/sedariwobur.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/pojuzalobejipakomejoxej.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/nasazituvelok.pdfIn PDF document text
    • http://clerus.hu/files/file/43822132453.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/63648442209.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6dbed9a5---44566825449.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/72663075425.pdfIn PDF document text
    • http://gibisch.biz/files/files/lefenujikewelo.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/jevirabodutimeluzel.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gimedoxixe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307106d1a19---xosazokelikakisuzetex.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/kunudidomubokukotenevegi.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/posarafadajukedebuparow.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/pifukezofewumerudidim.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/46423646371.pdfIn PDF document text
    • https://value.ae/userfiles/file/rovor.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/24715192524.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dufelibosibajoxisetejibi.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/87847558964.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/vozilufogapum.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10828 bytes
SHA-256: 795bd8f662d59b6f020f1f16a384d51119b1ab685f23455b3619ef9ba62fc461
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 18060 bytes
SHA-256: 3cd96bdf2b2bece4212762c1945ffd291ce4795ba5b8027300463b1f02e5fcbe
font_02_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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