Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12f8ba28c1684aa…

MALICIOUS

PDF

40.5 KB Created: 2020-03-30 14:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17ffc461c97e1070c1f248a66c26996b SHA-1: b9f121c67138fea799972edbc5f446d468b61b84 SHA-256: f12f8ba28c1684aa2e5a332d481d8f643a11bdfc11e1e369dc686e0a44912f1f
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This pattern suggests the PDF is used to artificially inflate search engine rankings or to distribute further malicious content via the linked PDFs.

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://mta-sts.mx.grandsalinelibrary.com/uploads/1/3/0/8/130873822/130873822.html#estrategia+global+de+mejora+escolar+primaria+formato
    • http://k9ssolutions.com/uploads/1/3/0/4/130483540/gubojosoke.pdf
    • http://www.fmtscience.org/uploads/1/3/0/3/130324011/0916cbb4e0.pdf
    • http://wildturkeycantina.com/uploads/1/3/0/5/130588343/giwawevigodo.pdf
    • http://emilygriffithrfp.com/uploads/1/3/0/5/130590082/15ae2a7384.pdf
    • http://markthalle93.ch/uploads/1/3/0/2/130289186/1d314065a0.pdf
    • http://tiffanyandrews.com/uploads/1/3/0/5/130545681/fupodavipoguzug.pdf
    • http://cgrisanti.org/uploads/1/3/0/4/130477882/fufujotebe.pdf
    • http://johnnymorney.com/uploads/1/3/0/9/130969179/ligutuxunego.pdf
    • http://headnet.de/uploads/1/3/0/6/130620841/628663.pdf
    • http://storyspinner.net/uploads/1/3/0/5/130546000/2477239.pdf
    • http://pan-education.com/uploads/1/3/0/3/130379243/6050598.pdf
    • http://elitemineralsinc.com/uploads/1/3/1/1/131164556/pidevax-pabaxovivimavi.pdf
    • http://impressivestone.com/uploads/1/3/0/6/130639548/8692731.pdf
    • http://rhythmandmovesdancestudio.com/uploads/1/3/0/4/130476313/6454666.pdf
    • http://the-potpourri.com/uploads/1/3/0/4/130435772/wesojev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007102.bin
2438f5bf683d78760a058d1f32694ee6cae3e65e6d5333400dba2bea519baba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7102 10336 bytes

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