Malicious PDF — malware analysis report

Static analysis result for SHA-256 db75d66fb34ca6c9…

MALICIOUS

PDF

53.9 KB Created: 2020-03-25 13:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c86a41ec04d1dfbf29a2e5f38f52a85a SHA-1: ae42dbbce1dfaf25535fbaa5b1ab40e35a460159 SHA-256: db75d66fb34ca6c9b7cfb825c4f05eaaefe16ba0758d816a49e5d37856ba71d9
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, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that aligns with the observed link farm behavior.

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://alexmcmichael.com/uploads/1/3/0/7/130775776/130775776.html#planeacion+de+matrogimnasia+en+preescolar
    • http://denverbikeblog.com/uploads/1/3/0/5/130589998/8775945.pdf
    • http://www.performancehealthandsafety.com/uploads/1/3/0/6/130604820/3051461.pdf
    • http://charlottepropertync.com/uploads/1/3/0/2/130292125/476101.pdf
    • http://mberggren.com/uploads/1/3/0/7/130738712/furigadonuzi.pdf
    • http://hostmaster.ietswijzer.nl/uploads/1/3/0/4/130489159/4566759.pdf
    • http://tetonenglish.com/uploads/1/3/0/7/130738569/500070.pdf
    • http://manoaoutdoorcircle.org/uploads/1/3/0/6/130639685/d7cc496940cb7.pdf
    • http://autodiscover.poppyavenueboutique.com/uploads/1/3/0/7/130738790/jifidewurekegem.pdf
    • http://www.promoverscville.com/uploads/1/3/0/5/130543133/da26a9dc.pdf
    • http://www.290pleasantstu313.com/uploads/1/3/0/3/130312951/bb2fa0bfbb5.pdf
    • http://lauraclarkmurray.com/uploads/1/3/0/4/130489418/2c46c94aa88.pdf
    • http://boltoncustomhomes.com/uploads/1/3/0/7/130776403/6360045.pdf
    • http://nodoubthomeinspection.com/uploads/1/3/0/5/130588731/mikisuti-poginutixaxu.pdf
    • http://harmonicdesign.com.au/uploads/1/3/0/5/130550743/zazasafu.pdf
    • http://sumobins.com/uploads/1/3/0/7/130775309/35643.pdf
    • http://wraybeauty.com/uploads/1/3/0/7/130739952/bixuzopuvapum.pdf
    • http://jfa-athletics.com/uploads/1/3/0/5/130590567/lenibusuforire_wifeduwinur_lixapolamesolas_godepurotu.pdf
    • http://twogunnedsaint.com/uploads/1/3/0/6/130639479/zesikoro-vuribakiwo-tafen-kivuxerid.pdf
    • http://circle-financial.info/uploads/1/3/0/9/130969185/209786.pdf
    • http://stpetersanglicanbundoora.com/uploads/1/3/0/7/130739227/saverilugas-bezugulifatif.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_off0000a538.bin
851ffee1cf218d6f73211abe54c89f948656798c764a0c59a1db2ff6da529ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA538 9808 bytes

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