Malicious PDF — malware analysis report

Static analysis result for SHA-256 5162786f0d873709…

MALICIOUS

PDF

72.5 KB Created: 2020-03-23 10:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d01b06fd620a3add3ff47912d960768 SHA-1: 937726b1f29665dfb9f2a568c0cc4db204649e61 SHA-256: 5162786f0d873709931e7c2c10deb8922f6dc98bb67e7fca1d1e8aaf978a9004
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata from the PDF generation tool, but the primary malicious activity is the mass of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme.

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://pressurecleanit.com/uploads/1/3/0/7/130739663/130739663.html#what+does+stowaway+mean+in+history
    • http://dasrausa.org/uploads/1/3/0/4/130435743/7a7f5492a36d.pdf
    • http://easterncarpetcleaning.com.au/uploads/1/3/0/7/130740145/funudinalopixib.pdf
    • http://pixelbrain.net/uploads/1/3/0/6/130639110/xopemujek.pdf
    • http://rockhillpestpros.com/uploads/1/3/0/9/130969921/3934626.pdf
    • http://splashingbonaire.com/uploads/1/3/0/8/130813982/dopiga_wuzejaf.pdf
    • http://www.angeliquedeclercq.be/uploads/1/3/0/9/130969755/pekagovo.pdf
    • http://www.bekemhealthcare.org/uploads/1/3/0/2/130272462/1b48599d45cf.pdf
    • http://channelthestar.com/uploads/1/3/0/2/130287278/0e38a6fc5.pdf
    • http://moobite.com/uploads/1/3/0/5/130588188/a1479b001d111.pdf
    • http://bootcrafts.com/uploads/1/3/0/7/130739746/pudurasored.pdf
    • http://lookinyou.com/uploads/1/3/0/9/130969312/zorulu.pdf
    • http://industrialpixie.com/uploads/1/3/0/6/130621089/5438705.pdf
    • http://www.jeffreyl.com/uploads/1/3/0/5/130550652/domuga-kemitekeka-wosawafu.pdf
    • http://futuresightbook.com/uploads/1/3/0/6/130621460/tuwobodapiwoji.pdf
    • http://thestashny.com/uploads/1/3/0/6/130639201/6784757.pdf
    • http://hostmaster.asup.it/uploads/1/3/0/3/130323196/tesagitun.pdf
    • http://ninthstreetstyle.com/uploads/1/3/0/2/130289320/2798777.pdf
    • http://aquariuscleaningservicenh.com/uploads/1/3/0/5/130588332/67107538831fe.pdf
    • http://www.phonecasecrazyoffer.com.au/uploads/1/3/0/7/130775462/femij.pdf
    • http://www.cindycontrerasmua.com/uploads/1/3/0/5/130539227/nosazolizubowajo.pdf
    • http://pacxo.us/uploads/1/3/0/6/130620341/xifafawo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb88.bin
6155cef26dfbc5f90266d7be2e9b66458ef3b98a1615f7c48cbb3880fd326df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 15832 bytes
font_01_sfnt_off0000fc7a.bin
a5b786739d048bbad1201f5c83ce305e34534417e788238e8c83059a5e534361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 16160 bytes

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