Malicious PDF — malware analysis report

Static analysis result for SHA-256 389b85e90a9bfc01…

MALICIOUS

PDF

62.9 KB Created: 2020-04-09 01:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: aa40e2f575aede20347cc71695e1f2eb SHA-1: 2b91a06542d41191db946d956efc04a77917a4f2 SHA-256: 389b85e90a9bfc015e3f02e2cfc19bc2c6f62ec9e55a7ace7c5868394f5602a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, indicative of a link farm or SEO poisoning attack. The primary URL directs to a page with Vietnamese text, suggesting a localized lure. No scripts were extracted, and the document body is heavily obfuscated, but the heuristic firings strongly suggest a malicious intent to redirect users to a network of potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://pameladirnberger.com/uploads/1/3/0/4/130491699/130491699.html#violet.vn+gi%C3%A1o+%C3%A1n+%C4%91i%E1%BB%87n+t%E1%BB%AD PDF link annotation
    • http://chiangmaiawards.com/uploads/1/3/0/5/130550841/248982.pdfIn PDF document text
    • http://luthersville.net/uploads/1/3/1/4/131453352/f5ec587b295522.pdfIn PDF document text
    • http://estaciondebuceo.com/uploads/1/3/0/6/130639181/detijowu.pdfIn PDF document text
    • http://spendlessdiscounts.com/uploads/1/3/0/9/130969236/fb7c4b9dcc0b.pdfIn PDF document text
    • http://masonboyd.com/uploads/1/3/0/8/130814718/zapubegaw.pdfIn PDF document text
    • http://frankyjay.net/uploads/1/3/0/6/130639815/gakurisize.pdfIn PDF document text
    • http://madisonhoteldemo.com/uploads/1/3/0/5/130545954/pividu_jirokorasezak_jidos_pimamo.pdfIn PDF document text
    • http://achswritersweek.com/uploads/1/3/0/6/130639476/d8c07520171857.pdfIn PDF document text
    • http://dareability.net/uploads/1/3/0/4/130483397/5452682.pdfIn PDF document text
    • http://solidificationtech.com/uploads/1/3/0/2/130272325/zatot.pdfIn PDF document text
    • http://crof.net/uploads/1/3/0/5/130544110/bewudupudanom_vekakegu.pdfIn PDF document text
    • http://mzphysics.com/uploads/1/3/1/1/131163772/furilusafuvafoveloz.pdfIn PDF document text
    • http://campchow.net/uploads/1/3/0/6/130621963/fekimakano-laxinimubowije-jojipopu.pdfIn PDF document text
    • http://the-unlimited-dream-company.com/uploads/1/3/0/2/130270923/rumugaziruparop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A43 12220 bytes
SHA-256: 2e5f3832131b58b186e89c4041f60c810cc431357b6ad02daabdb51f1473e5cb
font_01_sfnt_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 2736 bytes
SHA-256: 27aad4e7100ae85831cc1a9cf4859e84521ff6b1ee9ac199fa10e6c4d4b25dad
font_02_sfnt_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 25504 bytes
SHA-256: aab9d13a55c6ec7be1d11925f7fbc5ddaf494aceb896d683330f68f642459334

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