Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3e9344b9108a83…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 21:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 49a1731424f62ef61e1e2f5789d9494b SHA-1: cfe5bca69c894c3cb0b98960ce3670d1f54e6293 SHA-256: 0d3e9344b9108a83103af64fca2a7fadfb697c499fc9a0929f3d45a5cb589109
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests a phishing or malware distribution scheme. The document body, though truncated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=formula+to+find+perimeter+of+a+sector PDF link annotation
    • https://advance-pack.com/editor_upload/file/52410707902.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/56392467391.pdfIn PDF document text
    • http://aven.su/userfiles/file/bogifilazoge.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/31031761037.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/5749389911.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zixap.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/30787233464.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/9565663550.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/69200715798.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/dolek.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/tavutidanofugigazunalez.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wemowimufugatilipubup.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jegowutepudele.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/gurafugomubimafujuwomex.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5605635373.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kudez.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/kogutumum.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gevebapokugotuwoposez.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/20819811898.pdfIn PDF document text
    • http://annabarons.lv/files/files/21112423405.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/4018401850.pdfIn PDF document text
    • http://boxethai38.com/upload/file/folegevodafotire.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/gipidanunumujelix.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/guvotuza.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/jugugarujaxu.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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 17780 bytes
SHA-256: 450fbb450305f63f2ad4934111049648a824082bd6a39fa105ed07232f35f862
font_02_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10860 bytes
SHA-256: 2749d5f3d654af4b820e715efe1715dab58fe3b161cb77e3d56c69a38824701b

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