Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4c727f46978480…

MALICIOUS

PDF

42.5 KB Created: 2020-04-13 05:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 9a590b33f693ee53475ece96f67daa4d SHA-1: af2826ec8fb1905bd9c56710ffba60883114c042 SHA-256: df4c727f46978480e48434f5fb94df5a203a83bddd662545ba3b3aa0196f2cb1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, contains text related to 'Metodo de asignacion ejemplos resueltos' and metadata indicating it was generated by wkhtmltopdf. This suggests a link farm or SEO spam tactic designed to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious verdict.

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://brad9052.com/uploads/1/3/0/2/130273907/130273907.html#metodo+de+asignacion+ejemplos+resueltos PDF link annotation
    • http://listensis.org/uploads/1/3/0/6/130622048/burorowanujib-koxaziropix.pdfIn PDF document text
    • http://alanjviglionemd.com/uploads/1/3/1/4/131408741/a1d69.pdfIn PDF document text
    • http://produtosodontologicos.net/uploads/1/3/0/3/130313414/6175808.pdfIn PDF document text
    • http://allforhosts.com/uploads/1/3/0/5/130551671/wizizamonumug-sisepegojumala-nixabugul.pdfIn PDF document text
    • http://palmanannyagency.com/uploads/1/3/0/2/130270823/4287286.pdfIn PDF document text
    • http://suzannesauragraphsandmore.com/uploads/1/3/0/2/130274241/b831b.pdfIn PDF document text
    • http://sostenibilidaddelmenor.com/uploads/1/3/0/2/130272336/610371.pdfIn PDF document text
    • http://cloudtradingtechnologies.com/uploads/1/3/1/3/131398392/6467492.pdfIn PDF document text
    • http://votelarocca.com/uploads/1/3/0/4/130490668/64d6a.pdfIn PDF document text
    • http://fccontractors.net/uploads/1/3/0/6/130621210/f1650db7f2e2d.pdfIn PDF document text
    • http://mypromo.space/uploads/1/3/0/3/130379141/kawofise.pdfIn PDF document text
    • http://smallfryz.net/uploads/1/3/0/6/130621969/jivebutuwavegiwixuzi.pdfIn PDF document text
    • http://resolien.com/uploads/1/3/1/3/131380771/geretazumibadasodi.pdfIn PDF document text
    • http://lilacafe1.com/uploads/1/3/0/9/130969236/jawudozevadim_ronak.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
🗂 Part of campaign: octarinesec.com 13 samples

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 9464 bytes
SHA-256: 335aa6e25ad4de11c5bc53476c4557040f3df232c58e157c1e0ad4ae83c2311b
font_01_sfnt_off00008657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8657 16144 bytes
SHA-256: 4bc316074ab7a945bfab345755761abf3c0c30bbefcbffa3ce2a779be7417175

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